Science wheels and levers review

Wheels and rollers work by reducing which force?

• Gravity

• Friction

• Pushing

• Pulling

The first wheel was used for....

• a car

• machines

• pottery

• a bicycle

Which type of gear changes the direction of the force by 90 degrees?

• Spur gear

• Idler Gear

• Gear train

• Bevel gear

When you pull down on a pulley, the load will go....

• up

• down

• sideways

• nowhere

In a gear shaft, the gear being powered is called the...

• Driver Gear

• Driven Gear

• Idler Gear

• Spur Gear

The gear the changes the direction of a gear train is called the...

• Driver Gear

• Driven Gear

• Idler Gear

• Spur Gear

What is the definition of a fulcrum?

Answer explanation

The point on which a lever rests or is supported and on which it pivots

What is the definition of a wheel and axle?

Answer explanation

A machine consisting of a wheel attached to a smaller axle so that these two parts rotate together to transfer the force from one to the other

What is a lever?

Answer explanation

A rigid bar resting on a pivot (fulcrum) used to help move a heavy load with one end when pressure is applied to the other

How does a bicycle use gears and a chain to move a load.

Answer explanation

A bicycle uses two gears – one attached to the pedals and one attached to the back wheel. When you pedal the

larger gear on the pedal, the smaller gear on the wheel spins more times which means the wheel rotates more

than the pedal. This allows your force into the pedal to be magnified.