What is a gear?

• A wheel

• A wheel with teeth

• A wheel with blades

• A programming language

Gears can turn...

• Up & down

• Only one side

• Clockwise

• Clockwise & counter-clockwise

The input gear...

• will move the input gear

• will move another gear

• will spin around like crazy

• will be always small

The output gear...

• will be always bigger

• is moved by another gear

• will be always smaller

• will have more teeth

The gear ratio is the proportion of

• Output teeth divided by input teeth

• Input teeth divided by output teeth

Meshed gears will move in opposite directions

• True

• False

An idler gear will help me move two gears in the same direction

• True

• False

An idler gear is part of the gear ratio

• True

• False

To increase the rotational speed I need to increase the gear ratio

• True

• False

What is the gear ratio of the following picture? (the left one is the input)

• 7/20/30

• 30/7

• 7/30

• 3/2