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Force

If work done ...

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If work done by internal conservative force on a body is positive then comment on the change in kinetic and potential energy of the syste

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Q. A body is freely moving under the action of a conservative force. If the work done by this conservative force is 'a', change in kinetic energy 'b' & magnitude of change in potential energy is 'c', then

Q. Work done by internal and external forces is equal to change in the kinetic energy of the system.

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.

(b) 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 energy of the system of two bodies.

Q. If work done by conservative force is X, change in potential energy is Y and change in kinetic energy during motion is Z, then which of the following is compulsorily true?

Q. A body is displaced from position

A

B

. Kinetic and potential energies of the body at positions

A

B

K_{A} = 70 J, U_{A} = - 50 J, K_{B} = - 20 J

U_{B} = 30 J

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