Gravity

A boy throws a baseball up in the air. Why does the baseball fall back down to the ground?

• the mass of the baseball decreases, causing it to fall

• the weight of the ball causes the ball to fall

• the force of gravity causes the ball to fall

• the density of the ball causes the ball to fall

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NGSS.MS-PS2-2

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Who was the scientist who first identified the laws of gravity.

• Leonardo Da Vinci
• Galileo
• Edmund Halley
• Sir Isaac Newton

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Every object in the universe has

• magnetic pull
• gravity
• atomic force
• electronics

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NGSS.MS-ESS1-2

NGSS.MS-PS2-4

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Why would you land on the ground instead of floating off into the space? Because ...

• We are heavier than the Earth

• The gravity pull us to the center of Earth

• The air resistance is pushing against the gravity

What would happen, if gravity suddenly disappears?

• we will able to walk on the Earth surface

• we will hover in the space

• we will be pulled by the Earth

Which one is NOT the postive impact of gravity.

• Gravity keeps the air around us as a blanket, and it prevents air from escaping into space.

• We can stand, jump, walk, and run on the ground due to gravity.

• The gravity will make the planets collide.Gravity keeps all the planets in the orbit of the sun.

• Gravity keeps all the planets in the orbit of the sun.

What is gravity?

• A force
• Energy
• A push
• All of them

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NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Without gravity we would________. 

• Float away
• Stay in the ground
• Nothing would happen.
• I don't know

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NGSS.MS-PS2-4

NGSS.MS-PS2-5

Why a ball falls to the ground?

• Earth's force of gravity is GREATER than the ball's, so the ball gets attracted to the ground. 
• Earth's force of gravity is LESS than the ball's, so the ball gets attracted to the ground. 

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Which has more mass, Earth or the Moon?

• Earth
• Moon
• The same

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NGSS.MS-ESS1-3

NGSS.MS-PS2-4