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, provided no external forces act on the system.
- 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 total momentum and kinetic energy are conserved before and after the collision.
- C. The momentum of a body is the product of its mass and velocity.
- D. The total momentum of a system of interacting bodies remains constant, provided no external forces act on the system.
Explanation
The correct answer is D: The total momentum of a system of interacting bodies remains constant, provided no external forces act on the system. This statement accurately captures the principle of conservation of momentum, which asserts that in the absence of external forces, the total momentum of a closed system does not change.Option A describes Newton's second law, linking force and momentum change, but not conservation. Option B deals with elastic collisions specifically, where both momentum and kinetic energy are conserved, yet it doesn't express the general principle. Option C provides the formula for momentum but does not discuss conservation in a system.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Practise Force and Motion
1,416 free Force and Motion MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Force and Motion questions
When a force of 4N acts on a mass of 2kg for a time of 2 sec, what is the rate of change of momentum?
A force of 12 N gives an object an acceleration of 4m/s2, The force required to give it an acceleration of 10 ms-2 is
A mass of 10 kg moves with an acceleration of 10 ms-2, the force on it is
A force of 6N acts on a mass of 1kg which acquire velocity of 30ms-1, The times for which the force acts is
A force of 100 Dynes acts on mass of 5kg for 10sec. The velocity produced is_
The graph shows how the force on a body varies with time. Assuming that the body is moving in a straight line, by how much does its momentum change?