WHEELS ON THE GO

_____ makes things pulling or pushing things harder.

• Friction

• Rolling

• Gravity

Slippery things like snow and ____ makes less friction.

• water

• ice

• soil

How do wheels make less friction?

• by pushing

• by pulling

• by rolling

Where do wheels turn?

• on an axle

• on an edge

How can we reduce friction between the wheel and the axle?

• We put grease between them.

• We put rollers called bearings between them.

_____ makes the bearing roll smoothly.

• Water

• Grease

• Oil

_____ wheels can go across rough ground.

• Small

• Medium

• Big

Gears transfer _____from one place to another.

• light

• power

• force

Everybody knows who invented the wheel.

• TRUE

• FALSE

How can you move things easily without wheels?

• using a smooth surface

• using an axle