Which is a statement of the principle of conservation of momentum?
Correct answer: D. The total momentum of a system of interacting bodies remains constant, providing no external force acts
- A. A force is equal to the rate of change of momentum of the body upon which it acts.
- B. In a perfectly elastic collision, the relative momentum of the bodies before impact is equal to their relative momentum after impact
- C. The momentum of a body is the product of the mass of the body and its velocity
- D. The total momentum of a system of interacting bodies remains constant, providing no external force acts
Explanation
Conservation of momentum states that for an isolated system (no external force), the vector sum of momenta remains constant before and after interactions.
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About Force and Motion
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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