Unit D Crossword Fiona M.

2. simple machine that consists of a cylinder with a groove cut in a spiral on the outside
4. force a machine applies to an object
10. measure of the amount of force applied to a given area
11. device that helps us do work
14. amount by which a machine can multiply a force; calculated by diving the output force by the input force
15. combination of 2 wheels of different diameter ex. Doorknob
19. pair of wheels with teeth that interlink
21. measure of how the speed of the object is affected by a machine; calculated by dividing the input distance by the output distance
22. simple machine made up of a wire, rope, or cable moving on a grooved wheel; may be made up of one or many wheels; can be fixed in place or moveable
23. belt or chain to transfer energy from an energy source to an object

1. purpose or task
2. a group of parts that work together to perform a general function, forming a complex machine
3. force applied to operate a machine
5. system in which simple machines all work together; parts of a complex machine that have just one function are called subsystems and often contain a simple machine
6. simple machine made up of a flat surface, such as a board, at an angle to another flat surface, such as the ground or a table top; ramp
7. tool or device made up of one basic machine
8. of the bicycle that transfer your energy to the back of the wheel
9. force that opposes motion
12. work together
13. simple machine that looks like an inclined plane, but is forced into an object
16. measurement of how well a machine or device uses energy; can be calculated by dividing mechanical advantage by speed ratio or by diving work output by work input
17. simple machine made up of a rigid bar or plank that rotates on a fixed object called a pivot or fulcrum
18. a central point where a mechanism turns
20. smaller group of parts within a complex machine that performs a specific function