Defining Gravity

What causes a ball to fall to the ground after you throw it in the air?

• weight

• wind

• air

• gravity

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Gravity is a force.

• True

• False

Answer explanation

Gravity is a force. It is the natural pull of objects toward each other.

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Who was the scientist who was the first to seriously study gravity over 300 years ago?

• Albert Einstein

• Isaac Newton

• Thomas Edison

• Benjamin Franklin

Answer explanation

Isaac Newton was an English scientist and mathematician who was born in 1643.

What famously fell on Isaac Newton's head that caused him to study gravity?

• an apple

• the sky

• an orange

• a bird

Answer explanation

Once the apple became too heavy for its stem to hold it anymore, the gravitational pull of Earth brought the apple down on Sir Newton's head.

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True or False: As one object gets closer to another object, the force of gravity will increase.

• True

• False

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True or False: As one object gets closer to another object, the force of gravity will increase.

• True

• False

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Earth's gravity is ​ ​ (a)   ​ m/s2.​ ​

• 9.8

• 12

• 1,000

• 8.809

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Which model has greater gravitational attraction (if any)

• Model A

• Model B

• Both Model A and Model B (same gravity)

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True or False: No matter what direction you throw a ball, it will eventually fall to the ground.

• True

• False

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If you are holding an apple, a bowling ball, and a feather, then let go of them, ___

• they're all going down

• the feather will stay put

• only the bowling ball falls

• only the heavy objects fall

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