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