Question

A man of mass m is standing on a board and
pulling the board of mass m up with force F by the
pulley system as shown. Normal reaction between
man and board is

(1) mg -F
(3) (m + M) g + F
(2) mg + F
(4) (m - M)g - F​

Answer 1

Answer:

mg-F.

Explanation:

Since, the man is pulling the block on which he is standing hence the blocks mass will not come under consideration.

The normal reaction experienced by the man pulling the thread of the pulley will be given as F+N= his own weight which is mg. The man's weight is mg and when he will pull the block the reaction force will also be in upward direction.

So, F+N =mg now N =mg-F.

Answer 2

Answer:

option 1 is the correct answer