A 34-kg crate rests on a horizontal floor, and a 73-kg person is standing on the crate.

Question

(a) Determine the magnitude of the normal force that the floor exerts on the crate.

(b) Determine the magnitude of the normal force that the crate exerts on the person.

What is the logic behind this exercise?

Answer 1

The total force on the crate = 34g + 73g ( Downwards) Use g = 9.8m/s2 and net force in N

Normal reaction on crate = 107g ( upwards )

Wt. of person on crate = 73g ( downwards)

Normal reaction on person ( Upwards)

Based on Newtons Third law of motion