Chapter 12 work, power,and machines
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Created by:
esthervergesNCAchamp on February 27, 2012
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28 terms
Terms | Definitions |
|---|---|
 different examples for work are | you work on science problems. you got to work your toaster oven doesnt work raking out the tash is too much work |
| work is done only when a ____causes a change in the position or motion of an object in the direction of the applied force. | force |
| ____is calculated by multiplying the ____ by the ______ over which the force was applied. | work, force, distance |
| the unit of work and energy was named in honor of the english physicist ____ _____ ____ | James Prescott Joule |
| because work is calculated as ____times ____it is measured in units of newtons times meters, N•m | force, distance |
| A Nm can be converted into a_____. | joule |
| a _____is also equivalent to: 1kg•m2/s2 | joule |
| the quantity that measures work in relation to time is _____ | power |
| power is the ____ at which ___is done | rate, work |
| write the equation for power in word form: | power equals work divided by time |
| give the symbolic formula for power: | p=W/t |
| write the equation for work in word form | work equals force times distance |
| give the symbolic formula for work | W=F•d |
| whats equal to the total number of lawns mowed | work |
| whats equal to the rate of mowing | power |
| the SI unit of power is the | Watt |
| a ___is the amount of power required to do 1 joule of work in 1 second | Watt |
| work is done only when ____causes a change in the position or the motion of an object in the direction of the applied force. | force |
| Joule= | kg•m2/s2 |
| Symbolic formula for power | P=W/t |
| units for power | Watts |
| A Watt is equal to a _____. | j/s |
| Watt | one joule of work performed in one second |
| Joule | equals one Newton-meter |
| Power | amount of work performed over time |
| Work | force times distance |
| Simple Machine | an unpowered mechanical device |
| mechanical advantage | quantity that measures how much a machine multiplies force or distance |
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