Newton's Laws of Motion

Newton's First Law of Motion

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 upon by an unbalanced force.

Newton's Second Law of Motion

F=ma

Newton's Third Law

Action-Reaction

Inertia

Resistance of an object to change its motion

Unbalanced Forces

ALWAYS cause a change in motion. They are NOT equal in size, but ARE opposite in direction.

Balanced Forces

DO NOT cause a change in motion. They are EQUAL in size and ARE opposite in direction.

Mass

The amount of matter in an object

Force

A push or a pull resulting from the interaction of an object

Acceleration

The change in speed over time

Gravity

This force pulls all objects to the ground with the same acceleration

Friction

This opposes motion and slows objects down

Newton's 3rd Law of Motion

For every action, there is an equal and opposite reaction.

Forces always exist in ..

pairs

Newtons (N)

Unit of force

Objects with smaller masses have

Less inertia

Objects with larger masses have

More inertia

Velocity

Speed with a given direction

Law of Inertia

First Law of Motion

Law of Action-Reaction

Third Law of Motion

Weight

A measure of the force of gravity on an object