Chapter 8 Science Test Review (Energy and Work)

a change in position

• motion

• force

• energy

• work

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done when a force moves an object over a distance

• gravity

• friction

• work

• force

the force that pulls all objects toward the earth's center

• friction

• gravity

• motion

• work

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a push or a pull

• energy

• force

• motion

• work

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the ability to do work

• motion

• friction

• force

• energy

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the force that resists the movement of objects against each other

• friction

• force

• energy

• motion

Lucy pushed her pencil across the table to Maddie. Did Lucy do any work?

• yes, because the pencil moved over a distance

• no, because the pencil did not move

• no, because Maddie wanted to draw with the pencil

• yes, because Maddie wanted to draw with the pencil

Gary wants to carry two boxes of science supplies to the storage closet. The boxes are the same size. One box holds cotton balls. The other box holds glass beakers. Gary will do more work when he carries the beakers than when she carries the cotton balls. This is because ________

• the cotton balls weigh more

• the beakers have less weight than the cotton balls, and less weight requires greater force to move the box to the closet

• the beakers have more weight than the cotton balls, and more weight requires a greater force to move the box to the closet

• the beakers weigh less

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Mark pulled hard on a wagon full of firewood, but the wagon did not move. Did Mark do any work?

• yes, because Mark pulled hard on the wagon

• yes, because the wagon was full of firewood

• no, because the wagon did not move

• yes, because he tried

Gravity is measured by how much force it takes to move an object and how far the object moves

• true

• false; work