What is a statement of the principle of conservation of momentum?
A A force is equal to the rate of change of momentum of the object upon which it acts.
B In a perfectly elastic collision, the relative momentum of the objects before impact is equal to their relative momentum after impact.
C The momentum of an object is the product of the mass of the object and its velocity.
D The total momentum of a system of interacting objects remains constant, providing no resultant external force acts on the system.
ANSWER: D
The Physics Behind
- Just like any other conservation laws / principle, conservation of momentum means the total momentum before an interaction equals the total momentum after objects interact.
- This holds true in a closed system, that is, there is no external forces applied on the system.
- Momentum is always conserved as there is no other form of momentum unlike in other quantities like energy where we can say that there are instances that kinetic energy is conserved and in others it is not conserved [as there are other energy forms].
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