Gravity

Weight is a force that depends on mass and:

• friction

• gravity

• magnetism

• energy

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NGSS.MS-PS2-4

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Compared to your weight and mass on Earth, if you were on the moon:

• your weight and mass would be less.

• your weight would be less but your mass would remain the same.

• your weight would remain the same, but your mass would be less.

• your weight would be greater, but your mass would remain the same.

What is the weight of your backpack in Newtons? The mass of your backpack is 10 kg. (assume: g = 9.8 m/s²)

• 10 N

• 9.8 N

• 98 N

• 980 N

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NGSS.MS-PS2-4

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The picture shoes two stacks of books with masses of 3 kg and 6 kg, respectively. How do their weight compare on Earth?

• They have the same weight.

• The 6 kg stack has 1/2 the weight of the 3 kg stack.

• The 6 kg stack has 3 times the weight of the 3 kg stack.

• The 6 kg stack has twice the weight of the 3 kg stack.

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NGSS.MS-PS2-4

NGSS.MS-PS2-5

The picture shows a force vector arrow pointing down. The best name for this downward force is:

• gravity

• drag

• buoyancy

• friction

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The correct equation to solve for weight in Newtons is:

• W = m/g

• W = g/m

• W = grams

• W = mg

Calculate the weight in Newton's of the small stack of textbooks. (Mass = 3 kg; Assume on Earth g = 9.8 m/s²)

• 0.306 N

• 3 N

• 29.4 N

• 58.8 N

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NGSS.MS-PS2-4

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On Earth, the acceleration due to gravity is constant. Without air resistance, objects will fall to the ground at the same acceleration.

• True

• False

The acceleration due to gravity on Earth is .....

• g = 1.6 m/s²

• g = 3.8 m/s²

• g = 9.8 m/s²

• g = 24.6 m/s²

A free-falling object falls at an acceleration of 9 m/s² (with air resistance). How fast is it going after two seconds?

• 9 m/s

• 18 m/s

• 27 m/s

• 36 m/s

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NGSS.MS-PS2-4

NGSS.MS-PS3-1

NGSS.MS-PS3-5