HMH Unit 1 Lesson 4

Jessica is comparing two balls. One ball has a mass of 1 kg, and the other has a mass of 2 kg. She pushes each with a force of 100 N. How do the accelerations of the two balls compare?

• The 1 kg ball accelerates the same as the 2 kg ball.

• The 1 kg ball accelerates half as much as the 2 kg ball.

• The 1 kg ball accelerates twice as much as the 2 kg ball.

• The 1 kg ball accelerates four times as much as the 2 kg ball.

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NGSS.MS-PS2-2

A fisherman steps off a boat, which is in the water, onto a dock. What happens?

• The boat and dock do not move.

• The boat moves toward the dock.

• The boat moves away from the dock.

• The dock moves away from the boat.

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NGSS.MS-PS2-1

What is the net force toward the right on the box?

• ON

• 50 N

• 100 N

• 2,500 N

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NGSS.MS-PS2-2

A car accelerates from 5 m/s to 27 m/s in 10 seconds. What is the acceleration in m/s2 ?

• 2.2

• 2.7

• 3.2

• 27

An airplane is traveling at a speed of 200 m/s relative to the Earth. A person walks toward the front of the plane at a speed of 1 m/s. How fast is that person traveling in reference to the other people on the airplane?

• 0 m/s

• 1 m/s

• 200 m/s

• 201 m/s

Carts A and B each have the same force applied to them. Cart A has half the mass of Cart B. How does Newton’s first law of motion predict the resulting accelerations of the carts?

• Cart A will have the greater acceleration.

• Cart B will have the greater acceleration.

• Carts A and B will have the same acceleration.

• The law cannot predict the accelerations without additional information.

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NGSS.MS-PS2-2

How are velocity and speed related to each other?

• Speed and velocity are both only a change in position over time.

• Velocity and speed both include the direction and a change in position over time.

• Speed includes the direction and a change in position over time, but velocity is only a change in position over time.

• Velocity includes the direction and a change in position over time (speed), but speed is only a change in position over time.

A force of 210 N is applied to an object and the object accelerates at 14m/s2 . Determine the mass of the object in kg.

• 45kg

• 32.5kg

• 15kg

• 52kg

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NGSS.MS-PS2-2

Two ice skaters on ice push away from each other. What will be the effect of the forces of their pushing each other if their masses are different?

• Both will move away from each other at the same speed.

• The person with less mass will move away faster

• The person with the most mass will move away faster

• Nothing will happen

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

A 1 kg object accelerates at a rate of 5 m/s2 . Calculate the net force on the object and explain how its motion is changing.

• 5N, the object is speeding up

• 5N, the object is slowing down

• 5N, the object has a constant speed

• 5N, the object is not moving

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NGSS.MS-PS2-2