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1. A type of gear with teeth that are not parallel to the gear's axis, but are instead at an angle.
2. Same as lever arm, the distance from the axis of rotation to the line of action of a force.
3. A type of pulley that only changes the direction of the force applied.
4. A pulley system consisting of a block that contains one or more pulleys and a tackle that is attached to the load being lifted.
5. A wheel with a grooved rim around which a cord passes, used to change the direction or point of application of a force applied to the cord.
6. An arrangement of pulleys used for mechanical advantage in lifting or pulling loads.
7. The perpendicular distance between the line of action of the force and the axis of rotation.
8. Mechanical devices used to transfer motion and energy between shafts by means of interlocking teeth.
9. The product of the force and the perpendicular distance from the line of action of the force to a reference point.
10. A gear with a screw-like thread that meshes with a toothed wheel to provide high gear reduction ratios.
11. An assembly of one or more pulleys and ropes or chains used to lift or move loads.
12. A pair of forces equal in magnitude, opposite in direction, and parallel but not collinear, causing rotation without translation.
13. The state in which the sum of clockwise moments is equal to the sum of counterclockwise moments around a point.
14. A pulley system that combines both fixed and movable pulleys to provide a greater mechanical advantage.
15. A set of two or more gears that transmit motion and torque from one shaft to another.
16. The ratio of the number of teeth of the driving gear to the number of teeth of the driven gear in a gear system.
17. A type of pulley that moves along with the load being lifted, providing a mechanical advantage.
18. The ratio of the force produced by a machine to the force applied to it, often increased by using pulleys.
19. The point about which moments are calculated, often chosen for convenience.