1.3 Video Quiz: Understanding Forces: Gravity and Friction

What is force described as in the context of physics?

• A chemical reaction

• A form of light

• A pull or push acting on an object

• A type of energy

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What can force cause an object to do?

• Change its color

• Increase its temperature

• Start or stop moving

• Produce sound

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Why does a ball thrown into the air come back down?

• It's attracted by the Moon

• Gravity pulls it towards the Earth

• Air pressure pushes it down

• It runs out of energy

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What happens to the force you apply to a ball as it rises after being thrown?

• It remains constant

• It increases

• It decreases until gravity pulls it down

• It turns into friction

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What effect does gravity have on objects?

• Makes them float

• Causes them to glow

• Makes them expand

• Pulls them towards the center of the Earth

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Why do leaves and ripe fruits fall to the ground?

• Because of wind

• Because they're attracted to the ground

• Because of gravity

• Because they lose their attachment

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What is friction?

• A force that pulls objects together

• A force that increases motion

• A force that exists in space

• A force that resists motion between two surfaces

What would happen if there was no friction?

• Objects would move faster

• Objects would not stop moving

• Objects would change color

• Objects would become heavier

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Which surface would likely cause more friction?

• Polished wood

• Carpet

• Glass

• Ice

What stops a ruler from sliding forever when pushed across a table?

• Air resistance

• Friction

• Magnetism

• Gravity

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