AnswersTX-Physics AUnit Test

Unit Test — Unit test Answers

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1
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For motion maps that illustrate accelerated motion, what does a new level indicate?

A
change in acceleration or direction
B
constant acceleration and direction
C
increased velocity
D
decreased velocity
2
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The diagram shows components that have been added together to form Rx and Ry. Rx and Ry are the components of the resultant vector.

Question illustration
A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
3

A velocity vs. time graph is shown.

Question illustration
A
0 m/s2
B
0.25 m/s2
C
4 m/s2
D
8 m/s2
4

The chart shows data for a moving object.

Question illustration
A
The object has negative displacement.
B
The object has negative acceleration.
C
The object does not have displacement.
D
The object is not accelerating.
5

Rhea is running towards Sean and kicks a soccer ball to him. Sean is standing still.

A
The speed of the ball from Sean’s reference frame would be greater than the speed of the ball from Rhea’s reference frame.
B
The speed of the ball from Sean’s reference frame would be less than the speed of the ball from Rhea’s reference frame.
C
The speed of the ball from Sean’s and Rhea’s reference frames would be 0 km/h.
D
The speed of the ball from Sean’s and Rhea’s reference frames would be less than 0 km/h.
6

Simon is riding a bike at 12 km/h away from his friend Keesha. He throws a ball at 5 km/h back to Keesha, who is standing still on a sidewalk.

A
5 km/h
B
7 km/h
C
12 km/h
D
17 km/h
7

The diagram shows a motion map.

Question illustration
A
The object has decreasing acceleration and increasing velocity.
B
The object has positive acceleration and eventually stops.
C
The object has decreasing acceleration and decreasing velocity.
D
The object has negative acceleration and eventually stops.
8

Study the motion map shown. Some of the vectors have been circled.What do the circled vectors represent?

Question illustration
A
distance
B
speed
C
velocity
D
acceleration
9

Xavier is roller skating at 14 km/h and tosses a set of keys forward on the ground at 8 km/h. The speed of the keys relative to the ground is km/h.

Answer not available
10

Study the velocity vs. time graph shown.

Question illustration
A
4 m
B
8 m
C
16 m
D
24 m
11

A velocity vs. time graph for an object is shown.

Question illustration
A
W and X
B
X and Y
C
Y and Z
D
W and Z
12

distancetimemotiondisplacement

A
distance
B
time
C
motion
D
displacement
13

The diagram shows three vectors.

Question illustration
A
Option
Option A
B
Option
Option B
C
Vectors P and Py are components of vector Px.
D
Vectors Px and Py are components of vector P.
14

Which three characteristics of an object are represented by a motion map?

A
velocity, length, time
B
acceleration, time, mass
C
mass, length, position
D
position, acceleration, velocity
15

Paco was driving his scooter west with an initial velocity of 4 m/s. He accelerates at 0.5 m/s2 for 30 seconds.What is his final velocity?

A
2 m/s
B
8 m/s
C
19 m/s
D
60 m/s
16

Which characteristic does an object with a constant acceleration always have?

A
changing velocity
B
constant velocity
C
fast speed
D
slow speed
17

Deena made a chart to summarize features of a velocity vs. time graph for objects with constant acceleration and objects with constant velocity.Which best describes Deena’s error?

Question illustration
A
The line for constant velocity is not horizontal; it is diagonal and slopes downward.
B
The area of the rectangle and the triangle under the line should be added together for constant acceleration
C
Find acceleration by finding the area of the rectangle above the line.
D
Find velocity by calculating the slope of the line.
18

Which formula is used to find an object’s acceleration?

A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
19

An object moving north with an initial velocity of 14 m/s accelerates 5 m/s2 for 20 seconds. What is the final velocity of the object?

A
39 m/s
B
90 m/s
C
114 m/s
D
414 m/s
20

Study the vector diagram.

Question illustration
A
54 cm
B
72 cm
C
5184 cm
D
5625 cm

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Unit Test — Unit test Answers — TX-Physics A