Crash Course: Gravity

What would happen to everything on Earth if there was no gravity?

• Everything would sink into the ground.

• Everything would fly off into space.

• Everything would become invisible.

• Everything would stay in place.

Who was the first person to seriously study gravity?

• Galileo Galilei

• Albert Einstein

• Nikola Tesla

• Isaac Newton

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What event led Isaac Newton to think about gravity?

• He was hit by an apple falling from a tree.

• He saw a bird flying.

• He dropped a book.

• He saw the moon in the sky.

What happens to a ball when you throw it to the left?

• It keeps going left forever.

• It goes up and stays there.

• It eventually falls to the ground.

• It disappears.

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What is the main cause of objects falling to the ground?

• Wind

• Gravity

• Friction

• Magnetism

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