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Hognosesam: Pulleys and Gears
This site gives a small amount of space to pulleys, and then provides a wealth of information about gears.
Technology Student
Technology Student: Gears and Pulleys
This site describes the basics of gears and pulleys, and their use in simple machines.
TeachEngineering
Teach Engineering: Gears: Lift It Up!
In this activity, students learn about the trade-off between speed and torque when designing gear ratios. The activity setup includes a LEGO pulley system with two independent gear sets and motors that spin two pulleys. Each pulley has...
The Franklin Institute
Spotlighting Simple Machines
Simple machines such as inclined planes in wedges and screws are explained.
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