Science 8 Chapter 01 Describing Motion Test#1

Which is true of a third-base run?

• The displacement is more than a first-base run and less than a second-base run, and the distance is more than a first-base run or a second-base run.

• The displacement is the same as a first-base run and less than a second-base run, and the distance is more than a first-base or second-base run.

• The displacement is the same as a first-base run and a second-base run, and the distance is more than a first-base run or second-base run.

• The displacement is more than a first-base or second-base run, and the distance is the same as a first-base run and less than a second-base run.

If you use two different reference points to describe the position of the same item, how will your descriptions differ?

• They will always differ in distance.

• They will always differ in direction.

• 1. They will differ in either distance or direction or both.

• 1. They will differ in either distance or direction but not both.

Which of these statements is true of displacement?

• 1. Displacement may be less than, equal to, or greater than the distance moved.

• 1. Displacement is always greater than the distance moved.

• 1. Displacement is either equal to or greater than the distance moved.

• Displacement is either equal to or less than the distance moved.

How can an object be in motion relative to reference point 1 but not relative to reference point 2?

• 1. If reference point 2 is not in motion relative to the object.

• If reference point 1 and reference point 2 are in motion together.

• 1. If reference point 1 is not in motion relative to the object.

• If only reference point 2 is in motion relative to the object.

When is the velocity of an object constant?

• when only its speed changes

• when only its direction changes

• when its speed and its direction both change

• 1. when neither its speed nor its direction change

What is the average speed of this car?

• 6 m/s

• 9 m/s

• 12 m/s

• 1. 18 m/s

Tags

NGSS.MS-PS3-1

A horse is galloping at a speed of 12 m/s. Ten seconds later, it is galloping at a speed of 16 m/s.

What is its average acceleration during those ten seconds?

• 0.4 m/s²

• 1. 0.8 m/s²

• 1.2 m/s²

• 0.6 m/s²

Tags

NGSS.MS-PS2-2

How often does the tip of an hour hand on a clock have the same velocity?

• once every minute

• once every hour

• 1. once every 12 hours

• 1. once every 24 hours

Which of the distance-time graphs matches the speed-time graph on the left?

• 
• 
• 
• 

Tags

NGSS.MS-PS3-1

Which of these has the same acceleration as a car that goes from 10 m/s to 16 m/s in 3 seconds?

• a motorcycle that goes from 15 m/s to 20 m/s in 4 seconds

• a runner who goes from 7 m/s to 10 m/s in 3 seconds

• a bird that goes from 4 m/s to 8 m/s in 2 seconds

• 1. a dog that goes from 8 m/s to 12 m/s in 3 seconds