Small Gear Turns Large Gear

In the picture

1. 1Small gear: the driver wheel with fewer teeth
2. 2Hand crank: the handle that turns the small gear
3. 3Large gear: the driven wheel with more teeth
4. 4Curved arrow above the small gear: clockwise rotation
5. 5Curved arrow above the large gear: anticlockwise rotation

Examples

• A bicycle drivetrain uses different-sized sprockets to change speed and pedalling force.
• A hand drill or egg beater uses a small gear turning a larger gear to increase turning force.

Quiz: Small Gear Turns Large Gear (Age 14)

1. 1

   When a small gear drives a larger gear, what happens to the larger gear?

   • It turns slower and with more turning force.
   • It turns at the same speed and with the same turning force.
   • It turns faster and with less turning force.
2. 2

   How do two meshing gears turn compared with each other?

   • In the same direction.
   • At right angles to each other.
   • In opposite directions.
3. 3

   In a small-to-large gear train, which gear is the driver wheel?

   • The large gear with more teeth.
   • The small gear with fewer teeth.
   • Both gears are driver wheels.

The answers, each with its explanation, are in the app. This quiz is free there while the lesson is in the free week.