# Newton's Three Laws of Motion

Note by *Anna*, updated more than 1 year ago More Less
 Created by PatrickNoonan about 6 years ago Copied by *Anna* about 6 years ago
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### Description

Note on Newton's Three Laws of Motion, created by *Anna* on 11/04/2013.

## Resource summary

### Page 1

Newton's Three Laws of MotionNewton's laws of motion are three physical laws that together laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to said forces. First law:An object at rest remains at rest unless acted upon by a force. An object in motion remains in motion, and at a constant velocity, unless acted upon by a force. Second law:The acceleration of a body is directly proportional to, and in the same direction as, the net force acting on the body, and inversely proportional to its mass. Thus, F = ma, where F is the net force acting on the object, m is the mass of the object and a is the acceleration of the object.Third law:When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction to that of the first body.

Isaac Newton

First law:An object at rest remains at rest unless acted upon by a force. An object in motion remains in motion, and at a constant velocity, unless acted upon by a force.

Newtons first law is a re-statement of Galileo's law of inertia.

In simple terms, all objects are stationary until something/someone applies force on it. In a vacuum the object will travel forever but on Earth due to factors such as friction, art resistance etc objects slow down over time

Second law:The acceleration of a body is directly proportional to, and in the same direction as, the net force acting on the body, and inversely proportional to its mass. Thus, F = ma, where F is the net force acting on the object, m is the mass of the object and a is the acceleration of the object.

Force = Mass x Acceleration

F= ma

Don't confuse Mass with Weight

Mass  ≠ Weight

Force is measure in Newtons.

Third law:When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction to that of the first body.

To every action there is an equal and opposite reaction

Intro

1st Law

2nd Law

3rd Law

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