Science

A meteor moving 468 km per minute traveling in a south-to-north direction passed near Earth in 2013. Because the meteor was only 45 m wide and was 27,700 km above Earth’s surface, it was not visible without the aid of a telescope.

Which statement describes the meteor’s motion?

• Its velocity was 7.8 km/s northward.

• Its acceleration was 468 km/s2.

• Its speed was 468 km/s northward.

• Its acceleration was 7.8 km/s2.

Tags

NGSS.MS-PS3-1

Which statement best describes the cart?

• F

• G

• H

• J

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NGSS.MS-PS3-1

Which of the following best describes the velocity of an object?

• 30 m/s

• 30 m east

• 30 m/s east

• 30 m/s2

What is the difference between the velocity and the speed of an object?

• Velocity is the change in distance over time, while speed is the change in velocity over

  time.

• Velocity has a direction associated with it, while speed has no specific direction.

• Velocity has no direction associated with it, while speed has a specific direction.

• Velocity is the change in speed over time, while speed is the change in distance over time.

The pickup truck has a changing velocity because the pickup truck —

• A

• B

• C

• D

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NGSS.MS-PS2-2

A large rock is motionless on a flat sidewalk. Which statement best explains why the rock remains motionless?

• There are no forces acting on the rock

• The only force acting on the rock is directed toward the sidewalk.

• The forces acting on the rock are all balanced

• The sidewalk exerts an unbalanced force on the rock.

Which statement correctly describes the reaction force between the bat and ball?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-1

Which statement correctly describes the reaction force between the bat and ball?

• F

• G

• H

• J

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Four boxes are sliding with constant speed before each box experiences an unbalanced force of 8 N. Which box would experience the greatest acceleration when the unbalanced force is applied?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

• A

• B

• C

• D

Tags

NGSS.MS-PS2-2