Gravity and Friction

When a roller coaster is at the very top of its track, what kind of energy is at its highest?

• A) Kinetic energy

• B) Sound energy

• C) Potential energy

• D) Heat energy

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Describe in one or two sentences what might happen to a roller coaster car's speed if there were no friction at all.

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True or False: A roller coaster car at the bottom of a hill has more potential energy than it does at the top of the hill.

• True

• False

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If a small toy car and a large toy car are dropped from the same height at the same time, which car will hit the ground first, assuming there is no air resistance?

• A) The small car

• B) The large car

• C) They will hit the ground at the same time

• • D) It depends on the material they are made of

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Give an example of how gravity affects your daily activities on the playground.

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Draw a simple picture of a roller coaster. Label where you have the most potential energy?

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What is gravity?

• A) the force that pushes objects upward

• B) the pull you feel when you turn a corner

• C) the push you feel as you fly in a plane

• D) the constant force that makes objects fall down towards the Earth. Also the force of attraction between objects with mass

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Catherine is studying the force of gravity in her science class. Which of the following is NOT a way for Catherine to observe the force of gravity?

• A) Observe baking soda react with vinegar.

• B) Drop a ball and watch it fall to the ground.

• C) Jump up and down on a trampoline.

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Jupiter has more mass than any other planet in our solar system. Mercury has less mass than any other planet. Which planet has the most gravity?

• A) Earth

• B) Jupiter

• C) Mars

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A yo-yo falls more slowly on Mercury than on Earth. What does this show?

• A) Mercury has the same amount of gravity as Earth.

• B) It depends on the shape of Mercury.

• C) Mercury has less gravity than Earth.

• D) Mercury has more gravity than Earth.

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