Unit 8 · Simple MachineThe Pulley
Words of This Topic
- Pulley : a round wheel with a grooved rim that rotates freely on its own axis.
- Load : the weight that the machine has to lift.
- Effort : the force applied to lift the load.
- Fixed pulley : a pulley that stays at one fixed place while it rotates.
- Movable pulley : a pulley that moves along with the load.
- Combined pulley : a pulley system that contains both fixed and movable wheels.
- Velocity ratio : the ratio of the velocity of the effort to the velocity of the load.
- Mechanical advantage : the ratio of the load to the effort.
- Effort distance : how far the pulled end of the rope moves from where it started.
- Load distance : how high the load rises from where it started.
- Economical : doing more work with less force.
- Spring balance : an instrument that measures force.