True / False type questions : It is necessary that the work done in the motion of a body over a closed loop is zero for every force in nature.

State if each of the following statements is true or false. Give reasons for your answer. a) In an elastic collision of two bodies, the momentum and energy of each body is conserved. b)Total energy of a systm is always conserved,no matter what internal and external forces on the body are present. Work done in the motion of a body over a closed loop is zero for every force in nature. d) In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the sytem.

Work done in moving a body over a closed loop in zer'. Is this statement true for all forces?

Assertion : A work done in moving a body over a closed loop is zero for every force in nature. Reason : Work done does not depend on nature of force.

Is it true for every force in nature that the work done by it on the undergoing motion in a closed loop is always zero?

True / False type questions : A body is moving along a circular path. No work is done by the centripetal force.

True / False type questions : In an elastic collision of two bodies, the momentum and energy of each body is conserved.

The work done by a body is the product of force and :

Statement-1 : Friction is non-conservation force. Statement-2 : This is because work done against friction, in moving a body over a closed path, is never zero.