7-2, IQWST - Why Do Some Things Stop While Others Keep Going?

When doesn't a rock have kinetic energy?

(Scientific Principal #1)

• When someone throws it off a hill.

• When it is rolling down a hill.

• When it is sitting on a hill.

• When it slides down a hill.

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The amount of kinetic energy a moving object has depends on which 2 things?

(Scientific Principal #2)

• its speed

• its mass

• its color

• its temperature

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What kind of energy does an elevated object have? (Scientific Principal #3)

• kinetic energy

• gravitational energy

• cosmic energy

• mass energy

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When does a cliff diver have the MOST gravitational energy? (Scientific Principal #4)

• When he is standing on top of the cliff.

• Just before he hits the water.

• Once he has made a splash and is under the water.

• A cliff diver only has kinetic energy and NEVER has gravitational energy.

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A roller coaster's gravitational energy increases as... (Scientific Principal #5)

• its speed decreases.

• its height decreases.

• its kinetic energy increases.

• it gravitational energy decreases.

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A falling ball looses its shape and bounces off the ground because it has... (Scientific Principal #6)

• kinetic energy

• heat energy

• elastic energy

• potential energy

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As a rigid (stiff) ruler is bent... (Scientific Principal #7)

• its elastic energy increases.

• its elastic energy decrease.

• its elastic energy stays the same.

• Rigid rulers can not have elastic energy.

Why doesn't a bouncing ball bounce for ever? (Scientific Principal #8)

• The kinetic energy and gravitational energy change into another type of energy.

• There is not enough kinetic and potential energy.

• The Earth's gravity becomes less as the ball continues to bounce.

• The elastic energy increases.

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Which of the following in NOT true about a bouncing ball?

(Scientific Principal #9)

• The ball becomes deformed when it hits the ground.

• The ball will eventually stop bouncing.

• Its energy changes between gravitational energy and kinetic energy.

• Its energy eventually disappears.

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What is the molecular difference between a cold object and a hot object? (Scientific Principal #10)

• Colder objects have molecules that move faster than objects that are hot.

• Colder objects do not have molecules.

• Hotter objects have molecules that move faster than colder objects.

• Hotter objects do not have molecules.

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