Forces & Newton's Laws

What is Newton's First Law of Motion?

An object at rest stays at rest, and an object in motion stays in motion at constant velocity, unless acted on by an unbalanced force

What is Newton's Second Law of Motion, in equation form?

F = ma (Force = mass × acceleration)

What is Newton's Third Law of Motion?

For every action, there is an equal and opposite reaction

What is the SI unit of mass?

The kilogram (kg)

What is friction?

A force that opposes motion between two surfaces in contact