Question

In the following situations identify the agent exerting the force and the object on which it acts. State the effect of the force in each case.
(a) A goal keeper applies force to stop a football.
(b) Pulling a spring.
(c) The apple which is thrown up comes down.
(d) Pushing a wall.

S.no Agent exerting the force Object on which force acts Effect of force

Answer 1

Answer:

Explanation:

1. Goal keeper is applying force to stop the football which is in motion.

He is using muscular force.

2. The person who is pulling a spring is Applying force in the opposite direction of the spring .

He is using muscular force.

3. An apple comes down on to the ground due to the gravitational pull of the earth. The earth is applying gravitational force to pull the apple.

4. Person is applying force to try to move a wall. he is using muscular force. since no change in wall is occurring we can say that the person is not doing work.