# Newton's 3 Laws of Motion

## Newton's First Law of Motion

An object that is at rest will stay at rest unless an external force acts upon it. An object that is in motion will not change its velocity unless an external force acts upon it. This means an object continues to do whatever it happens to be doing unless a force is exerted upon it. If it is at rest, it continues in a state of rest. If an object is moving, it continues to move without turning or changing its speed.

An example in this video below of this is a car the seat belt keeps the person from moving forward when a car stops. Also the car is stopped by running into a wall. These are acted on by a external force.

Newton's Law Of Inertia

## Newtons Second Law of Motion

Force equals mass times acceleration. Any mass that is gained or lost by the system will cause a change in momentum that is not the result of an external force. The second law can also be stated in terms of an object's acceleration. The heavier an object is the slower the acceleration is. The lighter an object is the faster the object will travel, but the less force it will have rather than a heavier object will have.

An example in this video below if you had two objects one heavier than the other and shoot them with the same amount of force the lighter one is going to travel faster and longer than the heavier one but the heavier one is going to have a larger force and is going to be harder to stop than the lighter one.

Newton's Second Law of Motion

## Newton's Third Law of Motion

For every action there is an equal but opposite reaction. This means for every force there is a reaction force that is equal in size but opposite in direction. If there is an object pushing there will be a force the same pushing on the object, but in the opposite direction.

Example down below a rocket is getting pushed into the ground with its high powered engine, this is the action. The reaction is the ground not letting the rocket go anywhere into the ground. The rocket could not travel anywhere because of this law.