Question

When a boy weighing 20 kgf sits at one end of a 4m long see -saw , it get depressed at the end .how can it be brought to the horizontal position by a man weighing 40kgf

Answer 1

Answer:

zero

Explanation:

REF.Image

Let us take, the normal

reaction extorted by

man on the load be 'N'

since, the load has downward acceleration of 'g'

Applying Newton's II law of motion (F

net

=ma)

⇒10g−N=10×g

⇒N=0

Since, the normal reaction on the load is zero

⇒ the man will experience no weight of

the load i.e. zero weight.