NGSS.MS-PS2-4

Tides are caused by __________.

• wind
• density differences
• gravity
• salinity differences

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NGSS.MS-PS2-4

Why would you weigh less on the moon compared to Earth?

• less air
• less sunlight
• more gravitational pull
• less gravitational pull

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NGSS.MS-PS2-4

Two factors effecting the magnitude of the force of gravity between 2 objects are...

• mass and distance 
• mass and matter
• distance and weight 
• weight and mass

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NGSS.MS-PS2-4

What pulls a ball back to earth?

• Gas
• Gravity
• Friction
• Molecules

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NGSS.MS-PS2-4

Look at the picture.  Is the force of gravity on the boy a push or a pull? 

• Pull
• Push

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NGSS.MS-PS2-4

When a star's gravitational pull is so strong that not even light can escape, it's called a what?

• Black hole
• Supernova
• White dwarf
• Nebula

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NGSS.MS-PS2-4

As mass increases, what happens to the gravitational force?

• It increases.
• It decreases.
• It stays the same.
• It acts as a 3rd degree derivative function.

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NGSS.MS-PS2-4

Why can astronauts jump and float a little on the Moon?

• Because the Moon's gravity is NOT that STRONG.
• Because the Moon's gravity is VERY STRONG. 

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NGSS.MS-PS2-4

What is gravity?

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

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NGSS.MS-PS2-4

Which of the following is stated in the law of universal gravitation?

• All objects in the universe move in an orbit around the sun.
• The force of gravity attracts all objects in the universe to one another.
• The force of gravity is the same between any two objects in the universe.
• The force of gravity between objects increases as the move farther apart.

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NGSS.MS-PS2-4