Force and Motion Vocabulary

A change in an object's position over time

a push or pull

a change in velocity with respect to time

the force of attraction between two objects due to their mass

• friction

• force

• gravity

• motion

Friction is a force that __________ the motion of one object moving past another

a measure of the amount of matter in an object

• mass

• weight

• gravity

• pound

a measure of how gravity pulls on an object

a force that needs to touch an object before it can affect it (example: friction)

forces that cancel each other out and do not cause an object to change its motion

• unbalanced force

• motion

• friction

• balanced force

forces that do not cancel each other out and cause an object to change its motion