Pulleys
Fixed vs movable pulleys; ideal effort F = G/n.
Simple machines (junior)Levers, pulleys, and mechanical efficiency.
Start here
Pulleys
With n supporting strands, the ideal effort is F = G/n, while rope travel is about n times the load travel.
Pulley: with n supporting strands, ideal effort F = G/n; rope travel is n× load travel.
Key formulas
F=\frac{G}{n}s_\text{绳}=n\,s_\text{物}
How to use
- Choose strand count n; set mass and pull F.
- Watch the load rise or fall.
- Compare with the ideal F = G/n.
Applications
- Pulleys: Pulley: with n supporting strands, ideal effort F = G/n; rope travel is n× load travel.
- Classroom focus: ideal effort F = G/n.
FAQ
Does more strands always help?
Ideally yes; friction and movable-pulley weight reduce the benefit in real systems.
What does MVP mean on this page?
An interactive sketch with formulas and parameters. Polished Ready labs are the full bench experience.
What does the “Pulleys” lab practice?
Tune parameters and match readouts to the “Pulleys” relations — useful for prep and demos.
Self-study or classroom?
Both — tune alone, or project “what if…?” demos in class.