Understanding Gears and Gear Trains

What is a wheel with teeth called?

• Pulley

• Axle

• Lever

• Gear

In a gear train, what is the gear called that you turn?

• Follower gear

• Driver gear

• Intermediate gear

• Idler gear

What happens to the follower gear when the driver gear is turned clockwise?

• It turns clockwise

• It moves up and down

• It turns anti-clockwise

• It stops

What is the purpose of an idler gear in a gear train?

• To change direction

• To make the follower gear rotate in the same direction as the driver gear

• To reduce force

• To increase speed

When a larger gear turns a smaller gear, what happens to the speed of the smaller gear?

• It turns slower

• It turns at the same speed

• It turns faster

• It stops

If a driver gear has 20 teeth and the follower gear has 10 teeth, what is the gear ratio?

• 1:1

• 1:2

• 2:1

• 1:3

Why does it become harder to pedal when you switch to a lower gear on a bicycle?

• Because the follower gear is larger

• Because the follower gear is smaller

• Because the driver gear is smaller

• Because the driver gear is larger

What happens to the speed and force when a smaller gear turns a larger gear?

• Speed increases, force decreases

• Both speed and force increase

• Speed decreases, force increases

• Both speed and force decrease

When cycling uphill, why do you switch to a gear that is easier to pedal?

• To reduce effort

• To reduce speed

• To increase speed

• To increase force

If an idler gear moves anti-clockwise, in what direction will the adjacent gears move?

• They will not move

• One will move clockwise, the other anti-clockwise

• Both will move clockwise

• Both will move anti-clockwise