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Underline the correct alternative:
(a) When a conservative force does positive work on a body, the potential energy of the body increases/decreases/remains unaltered.


Decreases

Positive work is done on a body by a conservative force when it displaces the body in the direction of force. As a result, the body advances toward the centre of force. It decreases the separation between the two, thereby decreasing the potential energy of the body.
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State True or False
In an elastic collision of two bodies, the momentum and energy of each body is conserved.

A. FALSE
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State True or False:
Total energy of a system is always conserved no matter what internal and external forces on the body are present.

A. FALSE
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State True or False:
Work done in the motion of a body over a closed loop is zero for every force in nature.

A. FALSE
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Underline the correct alternative:
(b) Work done by a body against friction always results in a loss of its kinetic/potential energy.

Kinetic energy

The work done against the direction of friction reduces the velocity of a body. Hence, the body loses an amount of Kinetic energy. 
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