A person is pushing a box across a table. The measured forces on the box are 10N, 14N, 7N, 10N.

Which force is represented by 7N?

force of friction

normal force

force of gravity

push force

I believe it is the force of friction. Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. For an object to be in motion on a solid surface the force applied must exceed the friction force. It is important to note that force of friction is proportional to the coefficient of friction and the normal force, force of friction is always tangent or parallel to the contacting surfaces and also the force of friction always opposes the direction of pending motion.