Question

1. What is the condition for a force to do work on a body?
2. State two examples when no work is done on a body when a force acts on it.
3. State the factors on which the kinetic energy of a body depends.​

Answer 1

Answer:

1) the condition is that force should act along the direction of applying force. Answer: For a force to do work on a body it should do NET DISPLACEMENT in the direction of force.

2) There is no displacement or movement although the heavy load may put force on the head or on the body. 2. Pushing an anchored tree, or a wall, are other examples, where futile efforts are put by applying force against an object which does not move or have a displacement.

3) IT DEPENDS ON MASS AND square of the VELOCITY. IF ANY ONE IS INCREASED THAN KINETIC ENERGY IS ALSO INCREASED.