## work power and simple machines

##### Created by:

uhlenhopp_tyler  on January 18, 2012

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# work power and simple machines

 What is workThe scientific definition of work is using a force to move an object a distance (when both the force and the motion of the object)
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#### 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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