# Newton's Laws

## What are Newton's laws?

All of Newton's laws depend on one another. Newton's first law of motion is referred to as the law of inertia. The first law is often stated as, "An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted on by an unbalanced force." Pushing a box would show this because they box stayed at rest until we acted on it. Newton's second law of motion is, "The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object." For example, is you use the same force to push a truck and a car, the car will have more acceleration than the truck, because the car has less mass. Newton's third law is, "For every action there is an equal and opposite reaction." An example would be sitting on a chair. Your body acts on the chair with one force and the chair reacts with another force.