Question

Which of the following forces are not equal but are opposite to each other? (i) the force you exert on the Earth when you stand and the force exerted by the floor on you (ii) the force a bat exerts on a ball and the force the ball exerts on the bat (iii) the force a piano player exerts on the piano key and the force the key exerts on the pianist​

Answer 1

Explanation:

option 1 is the correct answer

Answer 2

The following options are forces that are not equal but are opposite to each other;

1.) the force you exert on the Earth when you stand and the force exerted by the floor on you

- forces applied are different here but in opposite directions with same magnitude. As the force exerted by you will be a gravity force that is mg whereas floor exerts an upward force of same magnitude mg on you also. therefore net force is zero.

2.) the force a bat exerts on a ball and the force the ball exerts on the bat

- the force exerted by the bat hitting the ball will be equal in magnitude but opposite in direction of the force the ball exerts on the bat since our arms are stiff when we hit the ball forward and we don't feel the recoiling.

but if we relax our arm we'll feel a backward hit at the same moment.

3.) the force a piano player exerts on the piano key and the force the key exerts on the pianist will be of same magnitude but of opposite direction.