# Simple Machines Experiment: See How a Wheels & Axles Work

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In the Simple Machines app by Tinybop, students experiment with wheels and axles by sending a cyclist through an obstacle course. In this activity, you can see how wheels and axles work by getting outside and going for a ride together!

YOU NEED:
+ Bikes, scooters, or skateboards

SEE HOW A WHEEL AND AXLE WORK:
1. Ride bikes, scooters, or skateboards with your students.
2. Notice which direction you’re applying an input force.
3. Notice which direction you’re moving.

On a bike, the input force is applied in a circular motion, around and around as you pedal. The wheel and axle changes the direction of your force so you move forward in a line. With every pedal, you apply a strong input force over a short distance on the axle to move the wheel a greater distance with less force.

On a scooter or a skateboard, you push down on the ground to move forward. Again, the direction of your force is changed. But, the wheel and axle in a scooter or skateboard work in the opposite way a bike does. You apply a weaker force over a longer distance around the wheel and the axle turns a shorter distance with more force.

https://itunes.apple.com/us/app/simple-machines-by-tinybop/id936966570?mt=8
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