Motion Along a Straight Line Quiz (Chapter 3)

An object is dropped from rest from the top of a 400 m cliff on Earth.  If air resistance is negligible, what is the distance the object travels during the first 6 s of its fall?

• 30 m

• 60 m

• 120 m

• 180 m

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NGSS.HS-PS2-1

During a given time interval the average velocity of an object is zero. What can you conclude about its displacement over the time interval?

• Impossible to tell

• The displacement is zero.

• The displacement is infinite.

Does the speedometer of a car measure speed or velocity?

• Both

• Neither

• Speed

• Velocity

If you divide the total distance traveled on a car trip (as determined by the odometer) by the elapsed time of the trip, what quantity are you calculating?

• Average acceleration

• Average speed

• Average velocity

• Instantaneous velocity

If a subway train is moving to the left (has a negative velocity) and then comes to a stop, what is the direction of its acceleration?

• Positive and to the right

• Positive and downward

• Negative and downward

• Negative and to the left

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NGSS.HS-PS2-1

What is the acceleration of a rock thrown straight upward on the way up? At the top of its flight? On the way down? Assume there is no air resistance.

• On the way up: negative. At the top: zero. On the way down: positive.

• On the way up: positive. At the top: zero. On the way down: negative.

• 9.8 m/s² downward

• 9.8 m/s²

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NGSS.HS-PS2-1

The severity of a fall depends on your speed when you strike the ground. All factors but the acceleration from gravity being the same, how many times higher (y) could a safe fall occur on the Moon than on Earth (gravitational acceleration on the Moon is about one-sixth that of the Earth)?

• 6y

• (1/6)y

• 64y

• 36y

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NGSS.HS-PS2-4

While entering a freeway, a car accelerates from rest at a rate of 2.40 m/s² for 12.0 s. Draw a sketch of the situation and list the knowns in this problem. How far does the car travel in those 12.0 s?

• 28.8 m

• 172.8 m

• 57.6 m

• Not enough info

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NGSS.HS-PS2-1

At the end of a race, a runner accelerates opposite to the motion from a velocity of 9.00 m/s at a rate of 2.00 m/s². What is her final velocity after 5 seconds? Also, evaluate the result. Does it make sense?

• 1.0 m/s. Yes, the final velocity is positive.

• 1.0 m/s. No, the final velocity is positive.

• -1.0 m/s. Yes, the final velocity is negative.

• -1.0 m/s. No, the final velocity is negative.

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NGSS.HS-PS2-1

A powerful motorcycle can accelerate from rest to 26.8 m/s (100 km/h) in only 3.90 s. What is its average acceleration?

• 1.76 m/s²

• 104.52 m/s²

• 6.87 m/s²

• -26.8 m/s²

Tags

NGSS.HS-PS2-1