Chapter 14

2. arm - the distance between the fulcrum in a lever and the output force
4. a common unit of power equal to about 746 watts
7. plane - a slanted surface along which a force moves an object to a different elevation
8. mechanical advantage - the mechanical advantage of a machine in the absence of friction
9. the rate of doing work
14. the work done on a machine
16. machine - a combination of two or more simple machines that operate together
17. mechanical advantage - the ratio of the output force to the input force in a machine
19. - the percentage of the work input that becomes work output in a machine
21. - a simple machine that consists of a rope that fits into a groove in a wheel
22. output - the work done by a machine
23. the product of distance and the force in the direction an object moves
24. and axle - a simple machine that consists of two rigidly attached disks or cylinders, each one with a different radius

1. - a rigid bar that is free to move around a fixed point
2. the distance an output force acts through in a machine
3. the distance through which the input force acts in a machine
5. - a V-shaped object whose sides are two inclined planes sloped toward each other
6. - the fixed point a lever rotates around
10. the SI unit of power
11. the SI unit of work
12. a device that changes a force
13. - an inclined plane wrapped around a cylinder
15. the force exerted on a machine
18. advantage - the number of times that a machine increases an input force
20. - the distance between the fulcrum in a lever and the input force