Magnitude problem!!! what is the magnitude of a normal force on a 100 kg crate pushed with force of 200N?

Question

help! any good websites to explain this stuff?

Answer 1

Normal force is the force of interaction betwen the object and whatever it is sitting on. This crate must be sitting on the floor and exerting a force of 980 N on the floor (its weight). The floor MUST be exerting a force of 980 N on the crate by Newtons third law (if object A exerts a force F on object B, object B must exert a force F on object A). This force that the floor exerts on the box is the normal force and must be 980 N. The force that you are exerting on the box is likely in a horizontal direction, thus it does not contribute to this calcuation.

Definition:

Normal force: a force normal to the surface the object is sitting on that the surface exerts on the object.

Answer 2

The information is incomplete.

We need to know the DIRECTION of the pushing force of 200 N.

The normal force would include the force that the floor is using on the 100 kg crate PLUS the opposition of any vertical vector forces contained in the push.