![](/nationalgeographic/trailblazer_march_2019/getting_in_gear/215915/gear_large_shadow.400_0_1.png)
![](/nationalgeographic/trailblazer_march_2019/getting_in_gear/215912/gears_large_smudge.128_0_1.png)
left
right
![](/nationalgeographic/trailblazer_march_2019/getting_in_gear/215917/gears_small_smudge.128_0_1.png)
![](/nationalgeographic/trailblazer_march_2019/getting_in_gear/215922/gear_pin_small.128_0_1.png)
![](/nationalgeographic/trailblazer_march_2019/getting_in_gear/215921/gear_pin_large.128_0_1.png)
Print directions ›
![](/nationalgeographic/trailblazer_march_2019/getting_in_gear/215906/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