Gravity and the Earth

Who invented the universal law of gravitation?

• Isaac Newton

• Galileo Galilei

• Aristotle

• Nicolaus Copernicus

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Why do things seem to fall at different speeds on Earth? It is because ...

• Air resistance

• The mass

• The size

What is effecting the amount of gravitational force?

• The speed

• The distance

• The time

• The mass

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NGSS.MS-PS2-4

The natural force that pulls the objects toward each other called ...

• Gravity

• Light

• Space

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NGSS.MS-PS2-4

NGSS.MS-PS2-5

Does the gravity really pull down?

• yes, it pull us down

• no, it pull us to the center of Earth

• yes, it push out us of the Earth

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NGSS.HS-PS2-4

What happens when an object gets away from the Earth's gravity, but close to the Moon's gravity?

• The object will be pulled by the Earth's gravity

• The object will be pulled by the Moon's gravity

• The object will be hover in the space

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NGSS.MS-PS2-4

NGSS.MS-PS2-5

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

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NGSS.MS-PS2-2

NGSS.MS-PS2-4

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.

Mass and weight are two different quantities.

The mass of an object is the quantity of matter in it; usually measured in kilograms. But, weight is the force of an object that it is putting on a platform due to gravity.

• True

• False