AnswersWA-Physical Science BAcceleration

Acceleration — Unit test Answers

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1
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Jamal is 8 miles away from his house. He rides his bike home toward home at a speed of 12 mph..How far away from home is he after a half hour?

A
1 mile
B
2 miles
C
3 miles
D
4 miles
2
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The chart shows the movement of a ball after several seconds.

Question illustration
A
Column A should be “Time,” and Column B should be “Position.”
B
Column A should be “Position,” and Column B should be “Time.”
C
Column A should be “Velocity,” and Column B should be “Speed.”
D
Column A should be “Speed,” and Column B should be “Velocity.”
3

Beverly and Carl are in a race. Their graphs show the data.

Question illustration
A
Even though for a majority of the race they accelerated at the same rate, Carl won because his initial acceleration was greater than Beverly’s.
B
Even though for a majority of the race they accelerated at the same rate, Beverly won because her initial acceleration was greater than Carl’s.
C
Beverly accelerated at a greater rate for the entire race.
D
Carl accelerated at a greater rate for the entire race.
4

An object is placed at 0 on a number line. It moves 3 units to the right, then 4 units to the left, and then 6 units to the right. What is the displacement of the object?

1
1
5
5
7
7
1
13
5

Which refers to the rate of change in velocity?

A
speed
B
acceleration
C
direction
D
magnitude
6

Kiley went 5.7 km/h north and then went 5.8 km/h west. From start to finish, she went 8.1 km/h northwest.Which best describes her numbers?

A
5.7 km/h north and 5.8 km/h west are instantaneous speeds, while 8.1 km/h northwest is the average speed.
B
5.7 km/h north and 5.8 km/h west are average speeds, while 8.1 km/h northwest is the instantaneous speed.
C
5.7 km/h north and 5.8 km/h west are average velocities, while 8.1 km/h northwest is the instantaneous velocity.
D
5.7 km/h north and 5.8 km/h west are instantaneous velocities, while 8.1 km/h northwest is the average velocity.
7

best

I
Isla had negative acceleration, and Hazel had positive.
I
Isla's change in velocity occurred over a shorter time than Hazel's.
I
Isla had positive acceleration, and Hazel had negative.
I
Isla went a farther distance than Hazel.
8

Keisha told her friend that she can get to the town library by walking one mile east, turning left, and then walking a half a mile north.Which best describes how Keisha can improve these instructions to better help her friend find the library?

A
using meters as the unit instead of miles
B
drawing a picture of the library on a line diagram
C
estimating the amount of time to get to the library
D
providing a reference point
9

The graph indicates the running route for Tobias.Which best describes his run?

Question illustration
A
From time 0 to 6, he went fast and then slowed down.
B
From time 6 to 10, he was at his slowest.
C
From time 12 to 14, he went very slow.
D
From time 14 to 18, he went toward the starting point.

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