When a conservation force does positive work on a body, then the

When a conservative force does positive work on a body, the potential energy of the body

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.

STATEMENT-1 When a conservative force performs positive work on a body, potential energy of the system decreases. STATEMENT-2 Work done by a conservative force does not produce any change in kinetic energy.

A fountain of water shoots high in air. What probvides the force that does positive work on the water?

What is the condition for a force to do work on a body ?

When gravity is the only force doing work on a body, what can we say about its energy ?

S_(1): If the internal forces within a system are conservative, then the work done by the external forces on the system is equal to the change in mechanical energy of the system. S_(2): The potential energy of a particle moving along x- axis in a conservative force field is U=2x^(2)-5x+1 is S.I. units. No other forces are acting on it. It has a stable equalibrium position at one point on x- axis. S_(3) : Internal forces can perform net work on a rigid body. S_(4) : Internal forces can perform net work on a non - rigid body.

Give one example each in which a force does (a) positive work (b) negative work and (c ) zero work.

Under the action of a force F = Cx, the position of a body changes from 0 to x. The work done is