Unit 4 Vocab

A push or pull on an object with both magnitude and direction:

• Force

• Inertia

• Mass

• Friction

The tendency of an object to resist a change in motion:

• Normal force

• Acceleration

• Inertia

• Thrust

The quantity of matter in an object; measured in kilograms:

• Mass

• Weight

• System

• Tension

The force due to gravity on an object; calculated as W = mg:

• Friction

• Weight

• Normal force

• Rolling resistance

An object in motion stays in motion, and an object at rest stays at rest unless acted on by a net external force.

• Newton’s 2nd Law

• Newton’s 3rd Law

• Newton’s 1st Law

• F = ma

F = ma which shows the relationship of net force, mass, and acceleration.

• Newton’s 2nd Law

• Newton’s 3rd Law

• Newton’s 1st Law

• Reaction

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

• Newton’s 2nd Law

• Newton’s 3rd Law

• Newton’s 1st Law

• inertia

A diagram showing all external forces acting on a single object:

• System diagram

• Free-body diagram

• Mass chart

• Gravity table

A group of objects chosen for analysis, where only external forces are considered:

• Structure

• Model

• Object

• System

The upward force exerted by a surface that is perpendicular to the contact surface:

• Weight

• Thrust

• Normal force

• Resistance