A 33 kg crate rests on a horizontal floor, and a 77 kg person is standing on the crate.
(b) Determine the magnitude of the normal force that the crate exerts on the person.
The normal force is an outcome of Newton's third law:
"For every action, there is an equal and opposite reaction."
This tells us that the floor applies a force on the crate equal to the force the crate applies on the floor.
The solution calculates the normal force exerted by a crate.