Explanation:
Gravity always pulls objects such as a desk, book or person down. Thus, when you jump, gravity causes you to land on the ground. Friction, however, doesn't pull objects down. Instead friction occurs when something like a machine or individual pulls a sliding objects in the opposite direction of another object.
Pull affects gravity and friction in different ways. In fact, unlike gravity, friction doesn't rely on a natural force. The force of friction acting on the pages in a major reason that pulling the books apart is so different.
