Question

Which statement describes friction?

It is perpendicular to the surfaces that rub together.
It causes a change in motion.
It occurs in the same direction as the push force.
It pulls downward on a moving object.

Answer 1

"It causes a change in motion."

Friction is a force parallel to the surfaces in contact that opposes relative motion (or the tendency to move), so it can slow or stop motion. It is not perpendicular to the surfaces, not generally in the same direction as the push, and does not pull downward.