SCI 8: Forces, Motion, Electromagnetism Unit Review

If you have balanced forces, what is the net force?

• 0 N

• 30 N

• -30 N

• 90 N

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Opposites ________________ and likes repel.

• repel

• balance

• attract

• unbalance

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If the force used to push a shopping cart increases, the cart’s acceleration will

• decrease

• increase

• stays the same

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The THREE laws of motion were written by

• Hooke

• Galileo

• Einstein

• Newton

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In a car accident, a seat belt helps prevent injuries by applying a force

• less than the force of the moving passenger

• greater than the force of the moving car

• in the same direction as the car’s motion

• in the opposite direction of the passenger’s motion

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What force always tries to slow things down or stop them?

• gravity

• friction

• acceleration

• inertia

Scientists have created trains that use magnets to make the trains float above the tracks as they travel. These trains float because

• the track is waxed

• a chemical change occurs

• the train has a low density

• the like poles repel

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True or false - centripetal force is the force that keeps objects moving in a circular path.

• True

• False

The force of gravity between two objects is greatest when

• Masses are small and the objects are close together

• Masses are small and the objects are far apart

• Masses are large and the objects are close together

• Masses are large and the objects are far apart

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The cartoon below shows a humorous view of a law of motion. Which statement best summarizes the scientific concept shown in the cartoon?

• A falling body accelerates at a constant speed.

• The motion of an object is constantly changing due to magnetic forces.

• The force of friction causes an object in motion to move faster.

• A body in motion will remain in motion unless influenced by an outside force.