Gravity and Friction

A person sky diving is an example of _____ friction.

Is the Moon's gravity weak?

• True

• False

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NGSS.MS-ESS1-2

You have two balls. Ball 1 weighs 10 g and Ball 2 weighs 30 g. You drop them from a cliff. What does gravity do?

• Gravity pulls on both balls equally.

• Gravity doesn't act on either ball.

• Gravity pulls more on ball 1.

• Gravity pulls more on ball 2.

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Is the following statement true or false?

• The more friction between two objects, the more force is needed to move them. Is this correct?

• The less friction between two objects, the more force is needed to move them. What do you think?

Why don't you fall down as a ghost on Halloween night? What is this invisible force?

• Is it a contact force you can touch?

• Is it a force that opposes movement?

• Is it a non-contact force you can't touch?

• Is it Isaac Newton playing tricks?

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One of these statements about Halloween is true. Can you guess which one?

• Does the weight of a pumpkin change with gravity?

• The less mass a candy has the more gravitational force it will exert on another candy. True or false?

• Is gravitational force stronger in a haunted house than on earth?

• Is the weight of a ghost measured in pounds?

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What does GPE stand for in the context of a pumpkin falling from a height?

• Gross Pumpkin Energy?

• Gravitational Potential Energy?

• Gravity Pumpkin Energy?

• Gross Potential Energy?

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NGSS.MS-PS3-2

When would a ghost have the most kinetic energy?

• When it's at the top of a house

• Just before it swoops down

• After it swoops down, when potential energy transforms into kinetic energy

• It won't have any kinetic energy because gravity is pulling it down at a constant speed.

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NGSS.MS-PS3-5

A kid rolls a pumpkin down the street. Which type of friction is at play here?

• a non contact force

• a contact force

• rolling friction

• air resistance

• gravity

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NGSS.MS-PS2-2

JP climbed up a 120m high house and Cameron climbed a 50m high house. Who has more gravitational potential energy?

• JP

• Cameron

• Neither, they're just having fun!

Tags

NGSS.MS-PS3-2