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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State True or False: Work done in the motion of a body over a closed loop is zero for every force in nature.
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.
State True or False: Total energy of a system is always conserved no matter what internal and external forces on the body are present.
State True or False In an elastic collision of two bodies, the momentum and energy of each body is conserved.
