Mechanical advantage, forces, work, energy
Various pulleys with different degrees of mechanical advantage (1:1, 1:2, and 1:4) can be used with different masses and a newton scale to perform a quantitative demonstration.
-  1-kg mass
-  Set of various other masses
-  20-N display scale
-  1:1 pulley
-  1:2 pulley
-  1:4 pulley
-  Lab stand
-  Long aluminum rod
-  90-degree clamp
-  Hook clamp
- Mount the rod horizontally on the lab stands.
- Put the hook clamps on the rod.
- Hang the pulleys from the hooks.
- Arrange the strings for the appropriate levels of mechanical advantage.
- Put masses on the pulleys to keep them from shifting around too much.
- Be careful with the apparatus. The strings occasionally slip out of the pulleys.
- Weigh the 1-kg mass using the scale.
- Put a 1-kg mass on the 1:1 pulley.
- Use the scale to measure the force required to lift the 1-kg mass.
- Repeat for the other pulleys.
- PIRA 1M20.10
- Don't attempt this at home!
- Big Lever
If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.