Answers350CR Integrated ScienceSpeed and Velocity

Lesson 1: Speed and Velocity Answers

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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
2
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Which formula is used to calculate average velocity?

A
V Subscript a v g Baseline = StartFraction x Subscript f Baseline minus x Subscript I Baseline over t Subscript f Baseline minus t Subscript i Baseline EndFraction
Option A
B
V Subscript a v g Baseline = StartFraction t Subscript f Baseline minus t sub I over x sub f minus x sub I
Option B
C
Option
Option C
D
v Subscript a v g Baseline = StartFraction t over d EndFraction
Option D
3

distancetimemotiondisplacement

A
distance
B
time
C
motion
D
displacement
4

Study the position-time graph for a bicycle.

Question illustration
A
The bicycle has speed but not velocity.
B
The bicycle is moving at a constant velocity.
C
The bicycle has a displacement of 3 m.
D
The bicycle is not in motion.
5

Which is an example of speed?

A
Cindy biked westward at 30 km/h.
B
A rock is to the left of a flowerpot.
C
A dog runs an average of 8 mph.
D
Leo lives 2 miles north of Andre.
6

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.
7

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.
8

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
9

Which best describes a reference frame?

A
a distance over which an object moves
B
the difference between start and end velocity
C
a position from which something is observed
D
the average speed of a group of objects
10

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
11

A position-time graph is shown for a motorcycle driving south.

Question illustration
A
5 km/h south
B
24 km/h south
C
120 km/h south
D
150 km/h south
12

Which is an example of speed?

A
Cindy biked westward at 30 km/h.
B
A rock is to the left of a flowerpot.
C
A dog runs an average of 8 mph.
D
Leo lives 2 miles north of Andre.
13

What does the x represent on a motion map?

A
reference point
B
total displacement
C
speed
D
velocity
14

Which formula is used to calculate average velocity?

A
V Subscript a v g Baseline = StartFraction x Subscript f Baseline minus x Subscript I Baseline over t Subscript f Baseline minus t Subscript i Baseline EndFraction
Option A
B
V Subscript a v g Baseline = StartFraction t Subscript f Baseline minus t sub I over x sub f minus x sub I
Option B
C
Option
Option C
D
v Subscript a v g Baseline = StartFraction t over d EndFraction
Option D
15

Study the position-time graph for a bicycle.

Question illustration
A
The bicycle has speed but not velocity.
B
The bicycle is moving at a constant velocity.
C
The bicycle has a displacement of 3 m.
D
The bicycle is not in motion.
16

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
17

directionmagnitudetimemotion

A
direction
B
magnitude
C
time
D
motion
18

When compared to others, how is a greater velocity represented on a motion map?

A
with shorter vectors
B
with longer vectors
C
with larger dots
D
with smaller dots
19

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

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