Assertion: Location of centre of mass is independent of the reference frame.
Reason: Centre of mass is the same as centre of gravity.
Important Questions on Centre of Mass, Momentum and Collisions
Assertion: The centre of mass of electron and proton, when released moves faster towards proton.
Reason: Proton is heavier than electrons.
Assertion: Kinetic energy is conserved in both, perfectly elastic and inelastic collisions.
Reason: Because both types of collisions are identical.
Reason: In firing, momentum is conserved.
Assertion: In an elastic collision of two billiards balls, the kinetic energy is not conserved during the short interval of time of collision between the balls.
Reason: Energy spent against friction does not follow the law of conservation of mechanical energy.
Reason: For the sum of the momentum of three particles to be zero, all the three momentum vectors must be coplanar.
Assertion: Quick collisions are more violent than slow collisions.
Reason: Quick collisions are inelastic in nature.
Assertion: If a person jumps from a height with his legs rigid, then his ankle is more injured.
Reason: The force will be maximum on its ankle during the collision with the ground.
