work power and simple machines
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Created by:
uhlenhopp_tyler on January 18, 2012
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Science 1
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15 terms
Terms | Definitions |
|---|---|
 What is work | The scientific definition of work is using a force to move an object a distance (when both the force and the motion of the object) |
| Work or Not | According to the scientific definition what is work and what is not? a teacher lecturing to her class. is not work. |
| Formula for work | Work=Force x Distance The unit of force in newtons(N) The unit of distance is meters(m) The unit of work is newton-meters(N/m) One newton-meter is equal to one joule So,unit of work is joule. |
| Power | Power is the rate at which work is done. Power=Work/time (Force x distance) The unit of power is the watt |
| simple machine | a large wheel rigidly secured to a smaller wheel or shaft called and axle. |
| Pully | Consist of a grooved wheel that turns freely in a frame called a block. A pulley can be used to simply change the direction of a force or to gain a mechanical advantage depending on how the pulley is arranged |
| fixed pully | changes the direction if a force however it does not create a mechanical advantage |
| moveable pully | rises and falls with the load that is being moved. a single movable pully creates a mechanical advantage however it does not change the direction of a force. |
| Mechanical advantage | advantage of a moveable pulley is equal to the number of ropes that support the moveable pully |
| inclined plane | is an even sloping surface. The inclined plane makes it easier to move a weight from a lower to higher elevation |
| mechanical advantage | the mechanical advantage of an inclined plane is equal to the length of the slope divided by the height of the inclined plane. While the inclined plane produces a mechanical advantage it does so by increasing the distance through whicj the force must move. |
| Wedge | Is a modification of the inclined plane. They either separating or holding devices.double wedge is two inclined planes joined together with their sloping surfaces outward. |
| screw | Is a modified version of the inclined plane. Threads of the screw is a circular ramp |
| mechanical advantage of the screw | divide by the number of tuns per inch |
| Efficiency | input force x distance=output force x distance Never 100% due to friction |
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