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2 things that must be present for work to actually occur
1. There must be motion
2. Motion must be in the same direction as the force
Simple machine examples
Lever- seesaw, crow bar
Pulley- window blinds, sailboat pulleys
Wheel and axle- ferris wheel, door nob, car tire
Inclined plane- staircase, ramp
Screw- screws, spiral staircase, vice
Wedge- knife, wood stopper
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