4th Grade Unit 1 Lesson 1 Vocab

Front

Motion

Back

A change in an object’s position

Front

Speed

Back

How fast an object’s position changes over time at any given moment…distance/time

Front

Acceleration

Back

A change in velocity over time

Front

Velocity

Back

The speed AND direction of an object

Front

Force

Back

Push or pull

Front

Inertia

Back

The tendency of an object in motion to stay in motion OR of an object at rest to stay at rest

Front

Gravity

Back

A noncontact force that pulls objects toward each other

Front

Friction

Back

A force between surfaces that slows objects or stops them from moving

Front

Balanced Forces

Back

Forces that cancel each other out and don’t change motion

Front

Unbalanced Forces

Back

Forces that are not equal and cause a change in motion.