AnswersDISD CR Physics 2020-2021Speed and Velocity

Speed and Velocity Answers

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1
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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.
2
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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
3

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
4

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.
5

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
6

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
7

What does the x represent on a motion map?

A
reference point
B
total displacement
C
speed
D
velocity
8

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.
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

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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