Jackson Work and Machines Test
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Created by:
Jewal15 on April 18, 2011
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Classes:
9th GRADE!! HAPPY STUDYING!!, HIES 8th 2011, HIES Study Help
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21 terms
Terms | Definitions |
|---|---|
 What is work? | Transfer of energy through motion |
| 2 things that must be present for work to actually occur | 1. There must be motion 2. Motion must be in the same direction as the force |
| Work unit | Joules (J) |
| Formula for work | Force • Distance = work |
| Power unit | Watts |
| Power Formula | Work ÷ time = power |
| What is a machine? | Something that makes work easier |
| Simple machines | -Lever -Pulley -Wheel and axle -Inclined plane -Screw -Wedge |
| Simple machine examples | Lever- seesaw, crow bar Pulley- window blinds, sailboat pulleys Wheel and axle- ferris wheel, door nob, car tire Inclined plane- staircase, ramp Screw- screws, spiral staircase, vice Wedge- knife, wood stopper |
| lever definition | a rigid bar that pivots around a fulcrum |
| pulley definition | a wheel and axle with a grove and a rope and chain connected to it |
| wheel and axle definition | a wheel that rotates around a shaft (axle) |
| inclined plane definition | a sloping surface |
| screw definition | spiral inclined plane around a cylinder |
| wedge definition | inclined plane with 2 sloping sides |
| lever MA | MA = effort arm length / resistance arm length |
| pulley MA | count all the ropes besides the one that is being pulled down |
| wheel and axle MA formula | wheel radius ÷ axle radius = MA |
| inclined plane MA formula | length ÷ height = MA |
| screw MA | closer the threads are the higher the MA |
| Wedge MA | thinner the blade the higher the MA |
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