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screw Pulley it only changes the direction of the force, not the amount needed it only changes the amount of force needed, not the direction of the force inclined plane fulcrum
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L L a compound (or complex) machine A force has to be used on an object, and the object must move inclined plane
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inclined plane force mass distance It will take more effort force because there is more work being done screw
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8N 5 cm
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move the load and the fulcrum closer to each other A simple machine can increase the distance needed to do the work (which decreases the force needed). lever wheel and axle
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wedges levers 2.2 N The amount of work being done is the same. The box is lifted to the same height in both pictures. If work is the same and distance is increased, then #1 uses less force
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You will also need to review what you learned about: Forms of energy How energy changes forms Sources of different types of energy The law of conservation of energy Conduction, convection, and radiation Manipulated, responding, and controlled variables I recommend that you look over old tests and quizzes to help you to prepare for the review section of this test. I recommend that you review the Work and Simple Machines notes (standards 6-5.6, 6-5.7, and 6-5.8) as well as your Simple Machines webquest in order to prepare for the majority of this test. Solar, Chemical, Electrical, Heat, and Mechanical (potential and kinetic) Be able to look at diagrams and know the energy changes Batteries are sources of chemical energy, etc. Energy isn’t created or destroyed; it changes forms Be able to recognize the 3 types of heat transfer What do we change? What do we measure? What is kept the same?