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Forces Doing WorkLevers and

PulleysMore Simple

MachinesVariety

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Pushes and pulls.

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What does a force do?

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Changing the motion of an object.

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What is work?

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The pulling force between two objects, such as you and Earth.

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What is gravity?

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How much pull gravity has on an object.

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What is weight?

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Makes apples fall from a tree.

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What is gravity?

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A force that changes the motion of an object.

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What is work?

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An example is a rock sitting on the top of a hill.

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What is an example of stored energy?

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The ability to do work.

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What is energy?

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A type of energy that moves from one object to another.

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What is energy of motion?

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A ball player using a bat to hit a ball.

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What is an example of work?

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The fulcrum, load, and force.

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What are the three parts of a lever?

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The object being lifted or moved.

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What is the load?

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Makes work easier.

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What does a machine do for people?

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Changes the strength of a turning force.

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What does the wheel and axle do to make work easier?

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Helps to raise a sail on a sailboat. (levers and pulleys)

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How can a pulley make work easier?

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A ramp.

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What is an example of an inclined plane?

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Uses force to raise an object or split objects apart.

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What does a wedge do to make work easier?

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Ridges of the screw.

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What are threads?

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A simple machine wrapped around a screw.

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What is an inclined plane?

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A wedge used by farmers.

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What is a plow?

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Two or more simple machines put together.

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What is a compound machine?

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A doorknob.

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What is an example of a wheel and axle?

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Newtons.

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How do scientists measure weight?

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Helped to lift the heavy stones to the top of the ancient pyramids of

Egypt.

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A pulley.

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Lets you change the direction of a force.

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How does a machine make work easier?