AnswersHSPHY Physics Sem 1 26-27Vectors

Projectile Motion Answers

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1
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The angle a vector makes with the x-axis of a coordinate system must be what size in order to make one or more of its components negative?

A
less than 30 degrees
B
between 30 and 60 degrees
C
between 61 and 90 degrees
D
greater than 90 degrees
2
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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.
4

A truck heading east has an initial velocity of 6 m/s. It accelerates at 2 m/s2 for 12 seconds. What distance does the truck travel in the given time?

A
84 m
B
144 m
C
216 m
D
360 m
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

Alana is skateboarding at 19 km/h and throws a tennis ball at 11 km/h to her friend Oliver who is behind her leaning against a wall. What is the speed of the tennis ball if someone was watching the exchange on the sidewalk?

A
8 km/hr
B
11 km/hr
C
15 km/hr
D
30 km/hr
7

Which equation represents the Pythagorean theorem, which can be used to find the magnitude of resultant vectors?

A
R = A + B
B
R = A x B
C
R2 = A2 x B2
D
R2 = A2 + B2
8

Study the vector diagram.

Question illustration
A
8 m
B
16 m
C
60 m
D
136 m
9

Study the velocity vs. time graph shown.

Question illustration
A
4 m
B
8 m
C
16 m
D
24 m
10

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.
11

Diego is playing basketball. While running at 7 km/h toward Gino, he passes the ball to Gino horizontally. The ball travels at 20 km/h relative to Diego.

A
0 km/h
B
7 km/h
C
20 km/h
D
27 km/h
12

A jogger runs 5.0 km on a straight trail at an angle of 60° south of west. What is the southern component of the run rounded to the nearest tenth of a kilometer?

A
-4.3 km
B
-2.5 km
C
2.5 km
D
4.3 km
13

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
14

The diagram shows a motion map for a train.

Question illustration
A
The train traveled south and then north.
B
The train moved at a velocity of 75 mph north.
C
The train had a greater velocity when it moved away from the origin.
D
The train stopped for 3 seconds.
15

Suppose the initial position of an object is zero, the starting velocity is 3 m/s and the final velocity was 10 m/s. The object moves with constant acceleration. Which part of a velocity vs. time graph can be used to calculate the displacement of the object?

A
the area of the rectangle under the line
B
the area of the rectangle above the line
C
the area of the rectangle plus the area of the triangle under the line
D
the area of the rectangle plus the area of the triangle above the line
16

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
17

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
18

Two vectors are shown.

Question illustration
A
Vector X has greater magnitude than vector Y.
B
Vector Y has greater magnitude than vector X.
C
The vectors have the same displacement.
D
The vectors have the same direction.
19

Walt ran 5 kilometers in 25 minutes, going eastward. What was his average velocity?

A
0.17 km/min east
B
0.2 km/min east
C
5 km/min east
D
25 km/min east
20

directionmagnitudetimemotion

A
direction
B
magnitude
C
time
D
motion
21

Rosa studies the position-time graph of two race cars.Rosa concludes that truck X has a greater velocity than truck Y, and that truck Y had a head start. She also concluded that the graph shows both trucks moving at a constant velocity and that neither truck changes direction.

Question illustration
A
Both trucks change direction after they start moving.
B
Truck X had a head start, not truck Y.
C
Truck Y has a greater velocity than truck X.
D
The trucks are not traveling at constant velocities.

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