Question

when a pen is dropped on ground ,why it jumps although according to 3 law of motion it forces ground by mg and ground also do so??​

Answer 1

Explanation:

According to Newton's third law of motion ,

When pen is dropped to the ground,It touches the surface.

It is dropped downwards due to force of attraction (gravity). Force = mg. The pen is attracted to centre of earth. And in this order, the ground is in between, and To manage the force, ground applies a Normal Force.

It is also an example of action - reaction force.