Motion and Its Causes

Force and Newton’s Laws of Motion

What is inertia?

Inertia is the property of matter by which it resists acceleration. That is, an object that has inertia will remain at rest or will move in a uniform motion in a straight line unless acted on by an external force.

In this simple pendulum game called Newton’s Cradle, lifting one hanging ball and allowing it to drop and hit the second ball exerts a force on the next ball. The force on the ball at the other end causes it to swing out and back, according to Newton’s laws.

This is a web preview of the "The Handy Physics Answer Book" app. Many features only work on your mobile device. If you like what you see, we hope you will consider buying. Get the App