Unit D Crossword

3. a wheel with interconnecting teeth that rotates together
5. when a force acts on an object to make it move
8. simple machine that is shaped like a cylinder, but with grooves on the outside
9. this is calculated by dividing input distance by output distance
10. device that helps us do work
13. force that opposes motion
14. brain of a computer
15. physical form a device that makes it able to be used
16. group of parts that work together to perform a specific function
19. a complex machine moves an object by transferring energy from an energy to an object. A _______ is the part that transfers the energy.
21. amount of force applied to a given area
22. device that helps us do work, but is only made up of one basic machine
23. machine made up of 2 or more simple machines
24. a simple machine that is made of wires, ropes or cables wrapped around a certain amount of wheels

1. looks like a inclined plane, but it is forced into the object
2. plane is also known as a ramp
4. found in a complex machine and just has one function, usually made of a simple machine
5. consists of 2 wheels that are connected by a rod (axle)
6. simple machine that is made of a plank that rotates on a fixed object, called a pivot or fulcrum
7. force exerted by the machine
11. a system that uses liquid under pressure to move objects
12. linkage that transfers energy from the engine to the wheels
17. point at which a lever is supported and where it rotates
18. force applied to a machine
20. measurement of how well a device uses energy