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Potential Energy

When a conser...

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When a conservative force does positive work on a body, then the (1) Potential energy of body increases (2) Potential energy of body decreases (3) Total mechanical energy of body increases (4) Total mechanical energy of body decreases

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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.

(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 a body of mass

200 g

falls from a height

200 m

and its total potential energy is conserved into kinetic energy, at the point of contact of the body with the surface, then decrease in potential energy of the body at the contact is

Q. The total mechanical energy remains conserve in a free fall of body.

Q. Assertion :A body may gain kinetic energy and potential energy simultaneously. Reason: Conservation of mechanical energy may not be valid every time.

Q. Question 1
When a body falls freely towards the earth, then its total energy

(a) increases
(b) decreases
(c) remains constant
(d) first increases and then decreases

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