Forces and Motion

What is a force?

• a push or pull

• a machine made out of two simple machines

• and object dropped from a height

• the weight of a planet

If forces are balanced, what will an object do?

• stay still

• move up and down

• explode

• slide backwards

Two objects rubbing or moving against each other is

• friction

• force

• flumber

• fraction

The force between any two objects that have mass is called

• gravity

• friction

• force

• electricity

Speed in a certain direction is called

• velocity

• speed

• friction

• gravity

A change in velocity

• acceleration

• gravity

• friction

• mass

Check all the actions that are acceleration (change in speed or direction)

• turning around

• turning left

• hitting the brakes

• speeding up

• going the same speed

The length between two positions

• distance

• gravity

• acceleration

• friction

The time it takes for an object to go a certain distance

• speed

• acceleration

• distance

• friction

Lucy is chasing a squirrel. She keeps running 5mph but is running in a circle around the tree. Is she accelerating?

• Yes

• No

Answer explanation

Yes, because she is changing direction as she runs in the circle!