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31 Cards in this Set
- Front
- Back
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Large dams on rivers are an example of what source of energy?
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Potential energy
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What does kinetic energy allow you to do?
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Knock over pins with a bowling bowl.
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How does the body's potential energy allow us to throw a ball?
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The body changes stored energy into kinetic energy.
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What are some examples of simple machines?
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Wedges and pulleys
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Why do people walking on a wet surface sometimes slip?
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The water reduces the friction between the foot and the surface.
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What will oiling the chain of a bicycle do?
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Increase efficiency
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What causes a rolling bowling ball to stay in motion?
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inertia
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Energy is needed to do what?
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work
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What is an example of mechanical energy?
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an unwinding rubber band
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Kinetic energy is the energy of what?
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motion
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What lowers the efficiency of a machine?
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friction
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What makes work easier and has one or two moving parts?
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simple machine
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What is an example of something that has the most potential energy?
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an elevator stopped on the 7th floor
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When does a ball dropped from the top of the school have the most kinetic energy?
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just before it hits the ground
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When does a ball dropped from the top of the school have the most kinetic energy?
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just before it hits the ground
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Who developed the Law of Motion?
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Newton
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What simple machine would be most useful for lifting an object straight up into the air?
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pulley
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What simple machine would be most useful for loading the back of a truck?
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inclined plane
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The cutting edge of an ax is what type of simple machine?
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wedge
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If you want to stop a moving object, you must use what?
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force
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When you move a box, you do what?
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work
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A lever is made of a what?
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bar and fulcrum
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A skier who is standing still at the top of a mountain has what?
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potential energy
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When you use an inclined plane wrapped around a rod, you are using what?
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a screw
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What is make up of two or more simple machines?
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Compound machine
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What kind of force slows down two objects when the rub against each other?
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Friction
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__________ is the amount of work a machine does compared to the amount of energy put into using the machine.
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Efficiency
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The kind of energy stored in food is _________ energy.
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chemical
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What force pulls two objects together?
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Gravity
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A machine with many moving parts that usually has low efficiency is a
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complex machine
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High efficiency means a lot of work is done for the amount of ___________ being used.
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energy
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