Unit 6: Work, Power, and Simple Machines

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8 Terms

1
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Work

Work occurs when there is a force applied to and object and the object moves in the direction of the force.

The unit for force is N

2
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How do we calculate work?

Work= Force x Distance

Measured in Joules (J)

3
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Power

The rate of energy being transfer over an amount of time

The unit for power is Watts (W)

4
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How do we calculate power?

Power=Work/Time(s)

5
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Simple Machines

A device with few or no moving parts

Lower the amount of effort

Change the direction or distance of the force

Change the speed of resistance

6
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The 6 Simple Machines

Pulley

Inclined plane

Screw

Lever

Wheel & Axle

Wedge

7
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Friction and Simple Machines

Friction slows motion when two surfaces come in contact

8
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When single a simple machine and there is friction…

The work input is higher than the word output

Some of the energy is release as heat or sound