Acceleration

Acceleration is

• the rate at which velocity changes.

• the change in velocity

• the rate of change

• when you speed up only

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NGSS.HS-PS2-1

Velocity has two components

(pick 2 below)

• direction

• change in speed

• speed up

• slow down

In science, acceleration refers to

• increasing speed

• decreasing speed

• changing direction

• increasing speed only

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NGSS.HS-PS2-1

What does it mean when a change in velocity is negative?

• The object is speeding up.

• The object is slowing down.

• The object is changing direction.

• The object is falling down.

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In each of the following cases, determine where the car has no acceleration ?

• A car shortly after a stoplight turns green.
• A car approaching a red light
• A car with the cruise control set at 80 km/h
• A car turning a curve at a constant speed

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NGSS.HS-PS2-1

Which of the following is a unit for acceleration?

• km/s
• m/s²
• mi/hr
• ft

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NGSS.HS-PS2-1

If velocity is measured in meters/second and time is measured in seconds, the unit of acceleration is

• m/s/s

• m/s²

• m/s

• m

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NGSS.HS-PS2-1

If velocity is measured in kilometers/hour and time is measured in seconds, the unit of acceleration is

• km/s/s

• km/s²

• km/h/s

• km

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NGSS.HS-PS2-1

If velocity is measured in miles/hour and time is measured in seconds, the unit of acceleration is

• mi/h/s

• mi/s²

• mi/h²

• mi

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NGSS.HS-PS2-1

While driving at an average velocity of 15.6 m/s down the road, a driver slams on the brakes to avoid hitting a squirrel. The car stops completely in 4.2 seconds. What is the average acceleration of the car?

What should your answer's final unit(s) for this problem be?

• m/s/s

• m/s²

• m/s

• m

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NGSS.HS-PS2-1