![](/nationalgeographic/pioneer_march_2019/getting_in_gear/1135674/gear_large_shadow.400_0_1.png)
![](/nationalgeographic/pioneer_march_2019/getting_in_gear/1135671/gears_large_smudge.128_0_1.png)
left
right
![](/nationalgeographic/pioneer_march_2019/getting_in_gear/1135676/gears_small_smudge.128_0_1.png)
![](/nationalgeographic/pioneer_march_2019/getting_in_gear/1135681/gear_pin_small.128_0_1.png)
![](/nationalgeographic/pioneer_march_2019/getting_in_gear/1135680/gear_pin_large.128_0_1.png)
Print directions ›
![](/nationalgeographic/pioneer_march_2019/getting_in_gear/1135665/robot.240_0_1.png)
Turnthelargegeartothe right.Which way doesthesmallgear turn?
left
right
Turnthelargegear.
Atwhichspeeddoesthesmallgear turn?
slower
same speed
faster
Turnthelargegeararoundonetime.Howmanytimesdoesthesmallgearturn around?
one time
two times
three times
Try Again
Gearschangetheforce,speed,ordirectionofmotionwithinamachine.Seehowthesegearsworktogether.Clickandholddownthe"left”or"right"buttontoturnthelarge gear.
Welldone!
Play Again