Gears Checkpoint

Which of these does not use gears?

• Car

• Scissors

When the first gear turns clockwise, which way will the second gear turn?

• Clockwise

• Counterclockwise

Ethan and Aiden were playing with gears. They put these gears together.

Will these gears move?

• Yes

• No

When one of these gears turns, the other one turns at the same speed because they are the same size.

If one gear turns twice in 5 seconds, how many times will the other one turn in 10 seconds?

• Four times

• Twice

• Once

• Ten times

Look at these gears from a bicycle. The gears are different sizes.

When the pedals are used to turn the front gear once, the back gear turns 3 times.

Fill in the blank: This is because the front gear has 30 teeth and the back gear has ______teeth.

Gears of different sizes make a smaller force have a greater effect. These are the gears from a bike. The pedals turn the front gear.

Fill in the blanks:

When the pedals turn, the back gear turns more ____ than the front gear.

This is because the back gear is____ than the front gear.

This makes the back wheel turn____ and the cyclist moves quickly.

• slowly, smaller, more slowly

• quickly, bigger, faster

• slowly, bigger, more slowly

• quickly, smaller, faster

The picture shows the gears in a clock.

In which direction will the gears turn?

• Clockwise and counterclockwise

• Clockwise only

• Counterclockwise only

If I pedal at the same speed, in which of these bikes will the back wheel turn slower?

• A

• B

Look at these gears.

When a cyclist pedals clockwise [right to left], in which direction will the front gear turn?

• Counterclockwise

• Clockwise

Look at these gears.

When a cyclist pedals clockwise [right to left], which way will the back gear turn?

• Clockwise

• Counterclockwise