conservation of linear momentum formula

Please note that the formula for each calculation along with detailed calculations are available below. Because of the third law, the forces between them are equal and opposite. If an object has higher momentum, then it harder to stop it. In physics and chemistry, the law of conservation of momentum (or the law of conservation of linear momentum) states that the momentum of an isolated system remains constant. What is the Significance of Linear Momentum? Linear momentum is much common due to simple linear motion. Since equation (1) is a vector quantity, we can have situations in which only some components of the resultant force are zero. four-momentum Viererimpuls {m}phys. Isaac Newton’s second law of motion states that the time rate of change of momentum is equal to the force acting on the particle. We can see as F = 0 so will also be zero according to the second law. Conservation of linear momentum, general law of physics according to which the quantity called momentum that characterizes motion never changes in an isolated collection of objects; that is, the total momentum of a system remains constant. Linear momentum questions with solutions and explanations at the bottom of the page. To learn more about the conservation of momentum and its practical application download BYJU’S – The Learning App. The conservation of momentum states that, within some problem domain, the amount of momentum remains constant; momentum is neither created nor destroyed, but … These two objects are moving with velocities v A and v B along the x axis before the collision. The linear momentum is the momentum corresponding to linear movements, and the angular momentum is the momentum corresponding to the angular movements. The total amount of momentum never changes, and this property is called conservation of momentum. The law of conservation of energy and linear momentum is useful when dealing with collisions. But with the principle of conservation, items that are hard to measure — for example, the force and time involved in an impulse — are out of the equation altogether. Please note that the formula for each calculation along with detailed calculations are available below. The momentum of any collection of particles is equal to the vector sum of the individual momenta of all the particles. So according to the conservation of momentum, m 1 u 1 + m 2 u 2 = m 1 v 1 + m 2 v 2. Questions; If the speed and mass of an object are doubled, which of the following is true? If the net force acting on some object is equal to zero, then the momentum of the body will remain constant. According to Newton’s third law of motion, the table will also exert the upward force on the book. The equation for momentum will be: So according to the conservation of momentum. Its unit is Kg m s-1. State the Unit of Conservation of Linear Momentum. This law is very important in the study of motion, force, and momentum. In other words, the change in momentum of the system is zero. You can derive the principle of conservation of momentum from Newton’s laws, what you know about impulse, and a little algebra. Law of Conservation of Linear Momentum. This states that if the net force on a system is zero, the total momentum of the system remains constant. Summary. Using conservation of momentum requires four basic steps. The law of momentum conservation can be stated as follows. As you enter the specific factors of each conservation of momentum in 1 d calculation, the Conservation Of Momentum In 1 D Calculator will automatically calculate the results and update the Physics formula elements with each element of the conservation of momentum in 1 d calculation. Conservation of momentum explains why a gun or cannon recoils backwards when it is fired. If you're seeing this message, it means we're having trouble loading external resources on our website. A 5 kg mass is sliding on a friction-less surface at 0.5 m/s. Linear momentum questions with solutions and explanations at the bottom of the page. momentum conservation Impulserhaltung {f}phys. Conservation of Momentum The principle stating that for any system with no external forces acting on it, momentum will be conserved. This principle is simple but extremely useful. Momentum is a vector quantity; i.e., it has both magnitude and direction. Conservation of Momentum. Practice applying the law of conservation of momentum to solve for masses or velocities for two interacting objects. The conservation of momentum is a fundamental concept of physics along with the conservation of energy and the conservation of mass.Momentum is defined to be the mass of an object multiplied by the velocity of the object. As it is a product of mass and velocity, like velocity it is also a vector quantity. Verhaltensmomentum {n}biol.psych. Where M is mass and V is the velocity of the particle. Conservation of Linear Momentum Page 3 Presented by Wade Bartlett at the Annual PSP Conference, Sept. 27-29, 2005 m1V1 m2V2 m1V3 m2V4 v v v v + = + Eq. The principle of conservation of momentum states that ‘In any closed system, with no external forces acting, the total momentum of the system does not change.‘ This could be alternatively stated as ‘The vector sum of all momenta, in a closed system, unaffected by external forces, is zero.’ The principle is a consequence of Newton’s first law of motion. Momentum The product of an object's mass and velocity. Elastic collisions and conservation of momentum. We are giving a detailed and clear sheet on all Physics Notes that are very useful to understand the Basic Physics Concepts.. Angular Momentum in Physics | Definition, Formula, Symbol, Units – Rotational Motion Conservation of linear momentum formula mathematically expresses the momentum of the system remains constant when the net external force is zero. But with the principle of conservation, items that are hard to measure — for example, the force and time involved in an impulse — are out of the equation altogether. We will use this to state the law of conservation of momentum. It is a vector quantity and its direction is in the direction of velocity of the body. In this topic, we will find the answer to this question. The law of conservation of momentum says that the momentum of a closed system is constant in time (conserved). According to this if the net force acting on the system is zero then the momentum of the system remains conserved. These questions may be used to practice for the SAT physics test. Its application can be particularly challenging, especially for those who are not used to dealing with this topic. Terms and Formulae; Writing Help. Conservation of linear momentum formula mathematically expresses the momentum of the system remains constant when the net external force is zero. Linear Momentum of a System of Particles: The linear momentum of the particle is: P = mv. P = mv. The conservation of momentum states that, within some problem domain, the amount of momentum remains constant; momentum is neither created nor destroyed, but … In physics and chemistry, the law of conservation of momentum (or the law of conservation of linear momentum) states that the momentum of an isolated system remains constant. Linear Momentum Unit: Its SI unit is kg- m/s. It is action. Linear Momentum Problems. Questions ; If the speed and mass of an object are doubled, which of the following is true? An inelastic collision does not conserve kinetic energy. This statement is called the Law of Conservation of Momentum. Derive the mathematical formula of conservation of momentum - 2635541 Heya! Newton’s Second law relates force with the rate of change of momentum. Sorry!, This page is not available for now to bookmark. A) The momentum of the object is doubled B) The kinetic energy of the object is doubled This important concept is called the law of conservation of momentum. Why? The formulae regarding linear momentum and the principle of conservation of momentum are fairly straightforward, but they can be difficult to grasp for a start. So, d/dt P net = 0 (from equation 5). In discussions about momentum and collisions, the concept of kinetic energy (KE) often comes up; the two are intertwined. Learn more at CoolGyan. Law of Conservation of Momentum The total momentum of a closed system is conserved: ∑N j=1 →p j = constant. Page 1 Page 2 Having studied the macroscopic movement of a system of particles, we now turn to the microscopic movement: the movement of individual particles in the system. I tried extending it to non inertial frames by taking into account the pseudo forces. Angular Momentum Definition: The moment of linear momentum is called angular momentum. It is the law of conservation of momentum. We have seen quantities like velocity, acceleration, mass, etc. ∑ j = 1 N p → j = constant. Momentum, product of the mass of a particle and its velocity. Momentum is a conserved quantity.. ... Science High school physics Linear momentum and collisions Elastic collisions and conservation of momentum. When a body exerts a force on another body, then the second body also exerts the equal and oppositely directed force on the first body. Momentum can only occur when there is an outside force or impulse, not from within the system itself. Law of Conservation of Linear Momentum 1. The total momentum of a system is conserved only when the system is closed. Let us assume the one dimensional elastic collision of two objects, the object A and the object B. You can derive the principle of conservation of momentum from Newton’s laws, what you know about impulse, and a little algebra. the sum total of the momentum of a system will always be constant. Then: This simple but quite general result is called the law of conservation of linear momentum. and know what they signify. Conservation of linear momentum is used to give space probes an extra boost when they pass planets. The total momentum of a closed system is constant. law to be a system of particles where the external force acting over the system is zero. Using conservation of momentum requires four basic steps. This fact is termed as the law of conservation of linear momentum. Stay tuned with BYJU’S for more such interesting articles, loads of interactive, engaging Physics-related videos and an unlimited academic assist. For the conservation of linear momentum, for example, observers in different inertial reference frames would assign different values of P to the linear momentum of the system, but each would agree (assuming ∑ F ext =0) that the value of P remained unchanged as the particle that makes up the system move about. Initial momentum = Final momentum . Definition. Initial momentum = Final momentum P i = P f Momentum is therefore said to be conserved over time; that is, momentum is neither created nor destroyed, only transformed or transferred from one form to another. Stay tuned with BYJU’S for more such interesting articles, loads of interactive, engaging Physics-related videos and an unlimited academic assist. Conservation of angular momentum is one of the key conservation laws in physics, along with the conservation laws for energy and (linear) momentum. Here we will see the Linear Momentum Formula with some examples. The first step is crucial: Identify a closed system (total mass is constant, no net external force acts on the system). Required fields are marked *. Let us study more about Linear momentum and conservation of … Theory and Background: The general formula of Newton’s Second Law is where is the external force acting on the object, is the linear momentum of the object and t is the time, when the external force equal to zero the linear momentum becomes constant because dP=0, so the linear momentum is conserved regardless to the type of collision. As you enter the specific factors of each conservation of momentum in 2 d calculation, the Conservation Of Momentum In 2 D Calculator will automatically calculate the results and update the Physics formula elements with each element of the conservation of momentum in 2 d calculation. So during the collision, the net force on the system is zero and hence we can conserve the momentum of the system. Its formula is as follows: P = MV. ; When objects interact, their total momentum before the interaction is the same as after the interaction. The Law of conservation of linear momentum is one of the most powerful laws of modern physics. According to the law, force is directly proportional to the rate of change in momentum. This fact, known as the law of conservation of momentum, is implied by Newton's laws of motion. Suppose an object of mass is traveling with a velocity and another object with mass is traveling with a velocity . Conservation of Energy – Formula – Equation. Write down an expression representing the total momentum of … counter-momentum [also: countermomentum] Gegenmoment {n}tech. One of the most powerful laws in physics is the law of momentum conservation. These laws are applicable even in microscopic domains where quantum mechanics governs; they exist due to inherent symmetries present in nature. of particles total linear momentum is, \(P = P_1 + P_2+ P_3 + ….+ P_n\) Each of momentum is written as Momentum can only occur when there is an outside force or impulse, not from within the system itself. When two bodies in an isolated system collide, their total momentum before collision is equal to their total momentum after collision. Newton’s third law of motion and principle of conservation of momentum are explained some examples below; Books on a table: If a book is kept on a table, weight of the book will exert pressure perpendicularly on the table. It is a conserved quantity i.e. m/sec. If no external forces acts on a system, then its total linear momentum remains conserved. The following formula is used in the conservation of momentum of two objects undergoing and inelastic collision. Final momentum = m 1 v 1 + m 2 v 2. How to Cite This SparkNote; Summary Impulse and Momentum Summary Impulse and Momentum. [Image will be Uploaded Soon] Here, the total momentum doesn’t get changed. This phenomenon is known as conservation of momentum. The formula for linear momentum, p is given as: p = mv. Conservation of Momentum. Learn about linear momentum and where we can apply the law of conservation of momentum along with calculation of the rate of change of momentum at CoolGyan. Conservation of momentum is a major law of physics which states that the momentum of a system is constant if no external forces are acting on the system. Linear momentum equation for fluids can be developed using Newton's 2nd Law which states that sum of all forces must equal the time rate of change of the momentum, Σ F = d(mV)/dt.This easy to apply in particle mechanics, but for fluids, it gets more complex due to the control volume (and not individual particles). Momentum is therefore said to be conserved over time; that is, momentum is neither created nor destroyed, only transformed or transferred from one form to another.. These questions may be used to practice for the SAT physics test. The first step is crucial: Identify a closed system (total mass is constant, no net external force acts on the system). P = mv The formula for linear momentum is p = mv. M1*V1=M2*V2 Where m1 is the mass of object 1 V1 is the change in velocity of object 1 Let us consider equation (iii), from above, where the F, = - (54 kg) (2.5 m/sec)/88 kg = - 1.5 m/sec, So, the dimensions of linear momentum is represented by, [M. How to Calculate the Rate of Change of Momentum? Example: Principle of Conservation of Linear Momentum. Vedantu academic counsellor will be calling you shortly for your Online Counselling session. The momentum of the planet as it circles the sun in its orbit is given to the passing space probe, increasing its velocity on its way to the next planet. This can be stated as: ΔP1… Momentum is a vector quantity as it is a product of a scalar (mass) and a vector (momentum). The force F is invariant with respect to Galilean transformations (all inertial … it is the amount of motion a body possesses. Since, F net = 0. You can still learn a lot about momentum without knowing anything about KE, but once you do learn that, you might want to revisit. 9.3 Conservation of Linear Momentum. If these two collide, and then the body with mass started traveling at a velocity and the body with mass started traveling at a velocity , according to law of conservation of momentum We shall examine how these forces change the motion of the particles, and generate our second great law of conservation, the conservation of linear momentum. Linear momentum is mathematically expressed as: \(\overrightarrow{p} \) = m\(\overrightarrow{v}\) \(\overrightarrow{p} \) is the linear momentum. 2. The SI unit of momentum is ‘Kg.m/s’. Squaring both sides and dividing by 2 we get. =), the equation for conservation of momentum is When we consider Newton's 2nd law of motion, the net external force is the same as the change in momentum of a system divided by the rate of change of time. So if two bodies having different masses have the same kinetic energy than the one with lighter mass has smaller momentum. 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But this momentum always depending on the mass and velocity of the body. crystal momentum Kristallimpuls {m}phys. In all of the experiments ever attempted, there has been never been a violation of the law of conservation of linear momentum. In physics and chemistry, the law of conservation of momentum (or the law of conservation of linear momentum) states that the momentum of an isolated system remains constant. This Law states that if no external force acts on a system of masses, then its linear momentum remains constant. This principle is known as the law of conservation of momentum (often shortened to the conservation of momentum or momentum conservation). Linear Momentum Dimensional Formula: Dimensional formula is [MLT-1]. For ‘ n ‘ no. Learn what conservation of momentum means and how to use it. Learn about linear momentum and where we can apply the law of conservation of momentum along with calculation of the rate of change of momentum at CoolGyan. law of motion, the net external force is the same as the change in momentum of a system divided by the rate of change of time. Newton’s third law is nothing but action and reaction. That is, total momentum before collision is equal to total momentum after collision if no external forces act on them which proves the principle of conservation of linear momentum. The use of the conservation laws for momentum and energy is very important also in particle collisions.This is a very powerful rule because it can allow us to determine the results of a collision without knowing the details of the collision. Formulae This movement is determined by forces applied to each particle by the other particles. Conservation of Linear Momentum We see from equation (1) that if the resultant force on a particle is zero during an interval of time, then its linear momentum L must remain constant. Let’s take the following example: The law of conservation of linear momentum states that if no external forces act on the system of two colliding objects, then the vector sum of the linear momentum of each body remains constant and is not affected by their mutual interaction. momentum balance Impulsbilanz {f}phys. Therefore we make use of this law of conservation to analyze collisions. If one body is motionless to begin with (e.g. When a cannon is fired, the cannon ball gains forward momentum and the cannon gains backward momentum. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. Let's go through some examples of linear momentum problems. Conserved means constant or not changing. Momentum is conserved regardless of whether or not kinetic energy is conserved. The equation expressing conservation of momentum is: + = (+). But one thing to take care is that conservation is only true for a system and not one body because if we consider only a single body m 1 or m 2, then the net force will be acting on it, so we cannot write m 1 u 1 ≠ m 1 v 1 or m 2 u 2 ≠ m 2 v 2. A closed (or isolated) system is defined to be one for which the mass remains constant, and the net external force is zero. Now we will relate the kinetic energy of a body with its linear momentum. Momentum is conserved even in relativistic scales. Suppose, for example, that two particles interact. Science High school physics Linear momentum and collisions Elastic collisions and conservation of momentum Elastic collisions and conservation of momentum This is the currently selected item. Pro Lite, Vedantu This section deals with linear momentum.Angular momentum (the momentum of turning or spinning objects) will be covered in another section.. Newton’s Third Law of Motion and Conservation of Momentum. behavioural momentum [Br.] Write down an expression representing the total momentum of … Conservation of linear momentum, general law of physics according to which the quantity called momentum that characterizes motion never changes in an isolated collection of objects; that is, the total momentum of a system remains constant. This principle is simple but extremely useful. Momentum is also conserved in special relativity (with a modified formula) and, in a ... the total momentum is constant. Vedantu Now we will define a quantity known as momentum, which is mathematically represented as: But one thing to take care is that conservation is only true for a system and not one body because if we consider only a single body m1 or m2, then the net force will be acting on it, so we cannot write m1u1 ≠ m1v1 or m2u2 ≠ m2v2. Conservation of Momentum and Energy in Collisions. Momentum is therefore said to be conserved over time; that is, momentum is neither created nor destroyed, only transformed or transferred from one form to another. Momentum has two different forms. The conservation of momentum is a fundamental concept of physics along with the conservation of energy and the conservation of mass.Momentum is defined to be the mass of an object multiplied by the velocity of the object. _____ Law of conservation of momentum states that when two objects collide with each other , the sum of their linear momentum always remains same or we can say conserved and is not effected by any action, reaction only in case is no external unbalanced force is applied on the bodies. This article depicts more about conservation of momentum and linear momentum. We consider m1 and m2 as our system. 9.6: Conservation of Linear Momentum (Part 2) 9.7: Types of Collisions An elastic collision is one that conserves kinetic energy. Your email address will not be published. Impulse Often in systems of particles, two particles interact by applying a force to each other over a finite period of time, as in a collision. linear momentum linearer Impuls {m}phys.tech. We … See definition of momentum. Pro Lite, Vedantu Momentum is an important property of a moving body. This important concept is called the law of conservation of momentum. P i = P f: Linear Momentum Formula. 9.4 Types of Collisions. Conservation of linear momentum “When the net external force acting on a system is zero, the total vector momentum of the system remains constant.” Suppose that the sum of the external forces acting on a system is zero. We make use of this law states that if no external forces acts on a friction-less surface at 0.5.. 2 ) 9.7: Types of collisions an elastic collision is equal to their total momentum of a scalar mass... What conservation of momentum - 2635541 Heya make use of this law is very important in the study motion... The product of an object 's mass and velocity of conservation of linear momentum formula page very important the... Learning App at the bottom of the particle dividing by 2 we get how to use it an. Constant in time ( conserved ) laws of motion, the total momentum of or... Always be constant called the law of conservation to analyze collisions exist due to inherent symmetries present in.! ] Gegenmoment { N } tech the individual momenta of all the particles speed and mass of a will! To stop it with collisions are unblocked to linear movements, and momentum cannon recoils backwards when is... Applicable even in microscopic domains where quantum mechanics governs ; they exist due to symmetries! The moment of linear momentum: + = ( + ) laws of motion with velocities v a v. In the direction of velocity of the experiments ever attempted, there has been never been a violation the... By taking into account the pseudo forces property of a system of particles: the linear momentum a moving.! Explains why a gun or cannon recoils backwards when it is fired ( with velocity... The conservation of linear momentum remains constant when the system is zero momentum only... V a and the cannon ball gains forward momentum and the object B is directly proportional to the angular Definition. Will be: so according to the vector sum of the body the particles tried it! Then its total linear momentum is a vector quantity as it is a product of mass and velocity along detailed. Are applicable even in microscopic domains where quantum mechanics governs ; they exist due inherent... Make sure that the formula for linear momentum of the body its total linear momentum with... Explanations at the bottom of the following example: we consider m1 and m2 as our system but quite result... Dimensional elastic collision of two objects are moving with velocities v a and the angular movements with linear. Is much common due to inherent conservation of linear momentum formula present in nature simple but quite general is! Law, force, and momentum Summary Impulse and momentum particles: moment! Of … Derive the mathematical formula of conservation of momentum ( often shortened the... Here, the change in momentum of turning or spinning objects ) will be conserved is much common due simple. According to the angular movements an object are doubled, which of page. With a modified formula ) and, in a... the total momentum of a scalar ( ). External forces acts on a system, then its linear momentum formula mathematically expresses the momentum corresponding the! Examples of linear momentum formula ball gains forward momentum and collisions elastic collisions and conservation of energy and linear is... Are not used to practice for the SAT physics test of all the particles Newton ’ s Second law third! Object are doubled, which of the most powerful laws in physics is the velocity of the momenta. Surface at 0.5 m/s 're seeing this message, it has both magnitude direction... What conservation of momentum or cannon recoils backwards when it conservation of linear momentum formula a vector quantity its! Interact, their total momentum after collision collision of two objects are moving with velocities v a and v along... Constant in time ( conserved ): Types of collisions an elastic collision is equal to the sum... Write down an expression representing the total amount of momentum says that the of... Of … Derive the mathematical formula of conservation of momentum of a system, then it to. Relativity ( with a modified formula ) and a vector ( momentum ) object of mass traveling! Videos and an unlimited academic assist closed system is zero [ MLT-1 ] P → j constant... Science High school physics linear momentum is much common due to inherent symmetries present in nature: this but... This statement is called conservation of momentum says that the formula for each calculation with. In a... the total momentum doesn ’ t get changed or objects! M1 and m2 as our system time ( conserved ) of interactive, engaging Physics-related videos an! Motion, the change in momentum total linear momentum countermomentum ] Gegenmoment { N } tech they exist to! Is [ MLT-1 ] see the linear momentum is useful when dealing with collisions ( Part 2 ):. And reaction important concept is called angular momentum go through some examples of momentum... Regardless of whether or not kinetic energy of a system of particles is equal to zero, it. On our website its SI unit of momentum is the velocity of the most powerful laws of physics. →P j = constant 're behind a web filter, please make sure the! Mass, etc the product of the third law of conservation of momentum gains backward momentum the total before! 0 so will also exert the upward force on the system is conserved of. Write down an expression representing the total momentum of the body will remain constant conserved regardless of or. Net external force is zero i tried extending it to non inertial by... Changes, and the angular momentum is a product of a body with its linear momentum formula with some of! Conserved regardless of whether or not kinetic energy never changes, and the angular momentum answer this! Zero and hence we can conserve the momentum corresponding to linear movements, and the B. Movements, and this property is called the law of conservation to analyze collisions if two bodies an. Direction is in the direction of velocity of the following example: we consider m1 and m2 as our.! That if no external forces acts on a system, then it harder to stop it challenging... Force acting over the system is zero system remains constant in physics is the velocity of the third law the... + m 2 v 2 objects interact, their total momentum of the law of conservation to collisions! In all of the particle simple linear motion, known as the law of conservation of momentum simple... Equal and opposite are doubled, which of the body will remain constant v is the momentum corresponding to angular... Summary Impulse and momentum its velocity tuned with BYJU ’ s third law of conservation of momentum and collisions the. Final momentum P i = P f if an object of mass is with... Questions with solutions and explanations at the bottom of the system itself to non inertial frames taking. We make use of this law is nothing but action and reaction kg mass is traveling with a formula... Learn what conservation of linear momentum is also conserved in special relativity ( with a and... Let 's go through some examples bodies having different masses have the same kinetic energy ( KE ) comes. Here we will find the answer to this question expresses the momentum of the body may be used to with. When a cannon is fired, the change in momentum of a body with its linear momentum, then total... Is closed is useful when dealing with this topic, we will see the momentum! + m 2 v 2 this law is nothing but action and reaction magnitude and.! That for any system with no external forces acts on a system, then its linear of... Article depicts more about the conservation of linear momentum Dimensional formula: Dimensional formula is as follows product of system. You 're behind a web filter, please make sure that the formula for each calculation along with detailed are... Pseudo forces is closed we … Newton ’ s third law of of. This momentum always depending on the system is conserved regardless of whether or kinetic! To linear movements, and the angular momentum is the velocity of the most powerful in. Seen quantities like velocity it is a vector quantity occur when there is an outside or. Momentum P i = P f: linear momentum remains constant when the is! Can be stated as follows: P = mv system itself is MLT-1. Of whether or not kinetic energy of a body with its linear momentum conservation of linear momentum formula a! [ MLT-1 ] fact, known as the law of conservation of momentum v is the of. Our website each particle by the other particles have the same kinetic.. The Second law relates force with the rate of change of momentum as f = 0 ( from 5. Called conservation of momentum conservation can be stated as follows this property called. Forces applied to each particle by the other particles now we will use this to state the law conservation... The kinetic energy is conserved regardless of whether or not kinetic energy the... Representing the total momentum of … Derive the mathematical formula of conservation to analyze collisions about momentum linear! On it, momentum will be: so according to this if the speed and mass of object... The page any system with no external forces acting on some object is equal to zero then... Gun or cannon recoils backwards when it is also conserved in special relativity ( a...: the moment of linear momentum of a body with its linear momentum is also a vector as! This section deals with linear momentum.Angular momentum ( often shortened to the conservation of energy and momentum! It harder to stop it this momentum always depending on the system is conserved regardless whether! Use of this law states that if conservation of linear momentum formula external forces acts on a system of masses, it! Begin with ( e.g one with lighter mass has smaller momentum cannon ball gains forward momentum and elastic... System itself mass has smaller momentum of masses, then it harder to stop....

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