# force and motion

## what is force

Make a way through or into by physical strength; break open by force.

## what is friction

The resistance that one surface or object encounters when moving over another.

## key words and meanings

inertia inertness, especially with regard to effort, motion, action, and the like; inactivity; sluggishness.

acceleration increase of speed or velocity.
Newton's Laws of Motion

## newtons laws of motion

newtons first law: an object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by unbalanced force.

newtons second law: the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force in the dame direction as the net force and inversely proportional to the mass of the object.

newtons third law: for every action there is an equal and opposite reaction.

## what is acceleration

Increase in the rate or speed of something.

## what is interia

A tendency to do nothing or to remain unchanged: "bureaucratic inertia"