Physics Ch. 8

1. machines that are made out of two or more simple machines
4. a simple machine consisting of two circular objects of different sizes
5. the unit used to express power is joules per second (J/s)
9. P=W/t or power equals work divided by time
11. W=Fxd or work equals force times distance
14. a simple machine consisting of a grooved wheel that holds a rope or a cable
15. a simple machine consisting of a bar that pivots at a fixed point, called fulcrum
17. bar that pivots at a fixed point
18. the rate at which work is done
19. work output divided by work input times 100
20. the unit used to to express work (the Newton-Meter)

2. output force divided by input force
3. a simple machine that is a straight slanted surface
5. the work done by a machine
6. the work you do on a machine
7. an inclined plane that is wrapped in a spiral
8. a device that helps make work easier by changing the size or direction of a force
10. a doubled incline plane that moves
12. occurs when a force causes an object to move in the direction of the force
13. a comparison of a machine’s work output with the work input
16. tells you how many times the machine multiples force