True / False type questions : Work done by a body against friction results in a loss of its potential energy.

The work done by a body against friction always results in

Underline the correct alterntaive: a) when a conservative force does positivie work on a body, the potential energy of the body increase/decreases/remains unaltered. work done by a body against friction always results in a loss of its kinetic /potential energy. c) The rate of change of total momentum of a many-particle system is proportional to the external force/ sum of the internal forces on the system. d) In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy/total linear momentum/total enregy of the system of two bodies.

True / False type questions : Chemical, gravitational and nuclear energies are nothing but potential energiesfor different types of forces in nature.

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

True / False type questions : Total energy of a system is always conserved, no matter what internal and external forces on the body are present.

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

The work done by kinetic friction on a body :