Chapter 11 Test review

A woman walks 20 km in 4 hours. What is her average speed?

• 0.2 km/h

• 4 km/h

• 5 km/h

• 10 km/h

Which of the following is NOT an example of acceleration?

• a bicycle rounding a corner at constant speed

• a baseball falling to the ground

• a helicopter steadily ascending in a straight line at constant speed

• a golf ball rolling to a stop

A vector is a quantity that has

• a frame of reference and magnitude.

• time and direction.

• magnitude and direction.

• a frame of reference and time.

If you were to sketch a displacement-time graph and a speed-time graph for an object experiencing constant acceleration, what would they look like?

• Both graphs would be linear with the displacement-time graph being steeper.

• Both graphs would be linear with the speed-time graph being steeper.

• Both graphs would be nonlinear.

• The speed time graph would be linear; the displacement-time graph would be nonlinear.

Tags

NGSS.HS-PS2-1

A car is driving down the highway. From which frame of reference does it appear to NOT be moving?

• standing at the side of the road

• a car driving at the same speed but going the opposite direction

• sitting inside the car

• an airplane flying overhead

You travel 30 kilometers west of your home and then turn around and start going back home. After traveling 10 kilometers east, what is your displacement from your home?

• 20 km

• 20 km west

• 40 km

• 40 km west

A kayak is moving across a stream that is flowing downstream at a velocity of 4 km/h. The kayak's velocity is 3 km/h. What is the magnitude of the kayak's velocity relative to the river bank?

• 1.3 km/h

• 5 km/h

• 7 km/h

• 12 km/h

What is acceleration?

• the rate at which speed increases

• the time an object's velocity increases

• the rate at which displacement changes

• the rate at which velocity changes

A man walks around a track. As he walks around the curved part of the track, what happens to his speed and velocity?

• Neither his speed nor his velocity changes.

• His speed changes but his velocity does not.

• His speed does not change but his velocity does.

• Both his speed and his velocity change.

A sports car can accelerate from 0 m/s to 28 m/s in 4 seconds. What is the acceleration of the car?

• 24 s

• –7 m/s²

• 7 m/s²

• 7 m/s

Tags

NGSS.HS-PS2-1