Question

225. The principle of conservation of
energy cannot be applied in case of
(a) simple pendulum
(b) a particle moving in gravitational field
(c) frictionless movement of a principle
over a surface
(d) frictional movement of a particle over​

Answer 1

a partial moving on gravitional field

Answer 2

The principle of conservation of energy cannot be applied in the case of the frictional movement of a particle over a surface. Option(D) is the correct answer.

• Energy conservation only holds true for isolated systems. Because it is not isolated from the floor, a ball rolling across a rough surface will not abide by the law of conservation of energy. In actuality, the ball is being worked by friction on the floor.
• Everyday forces like friction are produced when two surfaces come into contact. The interaction between these surfaces as they move against one another raises their thermal energy.

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