Physics › Section G · Statics, torque, and rotation › Topic G.3
Simple machines and forces in the body
Crowbars, ramps and pulleys let a modest push move a heavy load, while your own muscles work the other way round, pulling far harder than the loads they lift. Both follow from the torque balance you have just learned.
In this topic
- What a machine does
- The lever
- Worked example: shifting a rock
- Wheels, axles and ramps
- Pulleys
- Muscles as levers
- Worked example: holding a shopping bag
- Forces at the joint
- Common mistakes to avoid
- Key takeaways
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