Work and Machines
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Created by:
eileenjoyce on March 7, 2010
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30 terms
Terms | Definitions |
|---|---|
 force and distance | The amount of work done on an object is obtained by multiplying |
| changing the direction of your force. | One way a machine can make work easier for you is by (flag pole) |
| nutcracker, scissors, knife | The output force is greater than the input force for a |
| seasaw, wheelbarril, bottle opener | What is an example of a second-class lever? |
| bicycle, pencil sharpener, door knob | Give an example of a complex machine? |
| no work is done. | If none of the force on an object is in the direction of the object's motion, |
| friction | What reduces the efficiency of a machine? |
| efficiency | What is the comparison between output work and input work? |
| screw | What type of machine is an inclined plane wrapped around a central cylinder? |
| wedge | What type of machine are your front teeth? |
| joule | What is the unit of work? |
| 100% | What is the efficiency of an ideal machine? |
| Efficiency = Output work divided by input work | What is the formula for efficiency? |
| changing the direction. | A machine can make work easier by |
| wedge | An ax, a zipper, and a front tooth are examples of what type of simple machine? |
| ideal mechanical advantage of wheel and axle | What are you finding when you divide the radius of a wheel by the radius of an axle? |
| gears | What is a compound machine with one wheel and axle linked to another wheel and axle? |
| fulcrum | The fixed point that a lever rotates around |
| combinatons of simple machines | Compound machines are |
| elbow. | When you bend your arm at the elbow, the fulcrum is at your |
| move some distance | In order to do work you must |
| mechanical advantage | the number of times a force exerted on a machine is multiplied by the machine. |
| axle | In a screwdriver, the handle is the wheel and the shaft is the |
| tendons | Muscles are attached to bones by |
| ideal mechanical advantage | The more efficient the machine is, the closer the actual mechanical advantage is to the |
| does not decrease | a machine ______ the amount of work you do. |
| screw | An inclined plane wrapped around a cyliner is a |
| pulley | What simple machine is a rope wrapped around a grooved wheel? |
| direction | A singe fixed pulley, such as a flagpole, changes the |
| wedges | When you bite into a sandwich, your front teeth act as |
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