Through illustrated examples and interactive practice problems, students explore the relationship of inertia and mass.

This lesson focuses on Newton's First Law: an object remains in the same state of motion unless a resultant force acts on it. If the resultant force on an object is zero, this means: a stationary object stays stationary; a moving object...

This article on weight will help you prepare for the AP Physics test. Included are example problems to help you practice.

Through illustrated examples and practice problems, students explore the centripetal force requirement. So for an object moving in a circle, there must be an inward force acting upon it in order to cause its inward acceleration.