unitD

2. is what the device is supposed to do
4. special type of cell
7. the force the machine applies the object
9. is a rigid bar or plank that can rotate around a fixed point called a pivot or fulcrum
10. is a system in which simple machines all work together
13. is a cylinder with a groove cut into a spiral on the outside
14. is a device that helps us do work
15. uses a liquid under pressure to move loads
18. is a combination two wheels of different diameter the turn together
20. force a machine applies to an object
21. ration is calculated by dividing the input distance by output distance
23. simple machine made up of wire,rope,or rope moving on a grooved wheel
24. the principle of transmission of fluid-pressure
25. is the force that opposes the motion

1. smaller group of parts within a complex machine the performs a specific function
3. is the measurement of how well a machine or device uses energy
5. is a tool or device made up of one basic machine
6. simple machine made up of a flat surface
8. simple machine that looks like an inclined plane but is forced into an object
11. amount by which a machine can multiply
12. is a group of parts that work together to perform a function
16. is the part that transfers your your energy from the pedals to the back wheel
17. is the measure of the amount of force applied to a given area
18. is done when force acts on objects to make the object move
19. The size of the gears and the sequence in which they engage define the ratio of the angular velocity
22. essential components of most mechanical systems