AnswersHSPHY Physics Sem 1 26-27Vectors

Vectors — Unit test Answers

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1
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Which best illustrates projectile motion?

A
A pictorial diagram showing a hot air balloon in four different positions, each the same height from the ground and equally spaced.
Option A
B
A pictorial diagram with a rocket launched straight upward. The first three positions of the rocket are shown with equal spacing between them.
Option B
C
A pictorial diagram with a person swimming and position shown in equal time intervals and equally spaced.
Option C
D
A pictorial diagram of a person hopping sideways at 5 different positions. The start and end positions are on the ground. The third image is the highest off the ground.
Option D
2
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The diagram shows two balls released from a device at the same time. The ball on the left falls freely from rest, and the ball on the right is launched horizontally.

Question illustration
A
Both balls have constant velocity and are acted on by gravity.
B
Both balls are acted on by gravity and are accelerating downward.
C
Both balls are pulled downward and have zero acceleration.
D
Both balls have zero acceleration and have constant velocity.
3

speedvelocitypositiondirection

A
speed
B
velocity
C
position
D
direction
4

Motion maps for two objects, Y and Z, are shown.At which time does Object Y pass Object Z?

Question illustration
A
2
B
3
C
4
D
5
5

What is the vertical acceleration of a dart that is launched horizontally with an initial velocity of 2.3 m/s?

A
–9.8 m/s2
B
0 m/s2
C
2.3 m/s2
D
9.8 m/s2
6

A car drives 16 miles south and then 12 miles west. What is the magnitude of the car’s displacement?

A
4 miles
B
16 miles
C
20 miles
D
28 miles
7

A boat travels in a straight path that is 25° west of north. Which describes the values of the west and north components of the boat’s displacement?

A
Both components are positive numbers.
B
Both components are negative numbers.
C
The west component is a negative number, and the north component is a positive number.
D
The west component is a positive number, and the north component is a negative number.
8

The diagram shows two vectors that point west and north.

Question illustration
A
10 meters
B
50 meters
C
1200 meters
D
2500 meters
9

A person riding north on a bicycle speeds up from 0 m/s to 9 m/s in 3 seconds. The acceleration of the bicycle is m/s2.

Answer not available
10

The diagram shows a position-time graph.

Question illustration
A
–2 m
B
–1 m
C
3 m
D
4 m
11

Which graph shows an object with constant acceleration?

A
Option
Option A
B
A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 10, and velocity in meters per second on the y axis, numbered 0 to 50. A line starts at the origin and goes to (4, 40), then a line from (4, 40) to (9, 40) and a line from (9, 40) to (10, 0).
Option B
C
A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 5, and velocity in meters per second on the y axis, numbered 0 to 10. A line starts at (0, 10) and ends at (5, 0).
Option C
D
A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 5, velocity in meters per second on the y axis, numbered 0 to 35. A curved line starts at the origin and arcs up to (4.3, 35).
Option D
12

The chart shows data for an object moving at a constant acceleration.

Question illustration
A
X: 0Y: 0Z: 1
B
X: 2Y: 4Z: 6
C
X: 3Y: 3Z: 3
D
X: 1Y: 5Z: 8
13

Jin walked 4 km on a straight path to get to the sandwich shop. He traveled 30° south of east.

A
-3.5 km
B
-2 km
C
2 km
D
3.5 km
14

Hannah made a chart to describe speed and velocity.

Question illustration
A
Switch the chart headings “Speed” and “Velocity.”
B
Describe the calculation for speed as “dividing distance by time.”
C
In the “Speed” column, change “has magnitude” to “is a displacement.”
D
Change the last row of the “Velocity” column to “does not depend on a reference frame.”
15

The motion map shows an object’s position and velocity at given times.How can the map be changed so it shows constant acceleration after the object changes direction?

Question illustration
A
by adding vectors that are all the same length and placing them above the current top row of vectors
B
by adding vectors that gradually increase in length and placing them above the current top row of vectors
C
by adding vectors that are all the same length and placing them below the current bottom row of vectors
D
by adding vectors that gradually increase in length and placing them below the current bottom row of vectors

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