Topic 2 Exp 1 Key Points Lesson

TEKS 7.7A, 7.7B, 7.1G, 7.2.A

Speed and
Velocity

KEY IDEAS

•What are distance and displacement?

•What is speed?

•What is velocity?

Words to Know

displacement
distance

speed
velocity

uniform motion

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Copyright © Savvas Learning Company LLC. All Rights Reserved. Savvas is not responsible for any modifications made by end users to the content posted in its original format.

What are distance and displacement?

Photo credit: 3d Jesus/Shutterstock

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What are distance and displacement? continued

Displacement is the length of a straight line between two points. The distance is the total length of the path taken from point A to point B.

Photo credit: 3d Jesus/Shutterstock

Multiple Choice

What is displacement?

• Displacement refers to the change in speed of an object over time.
• Displacement is the length of a straight line between two points.

• Displacement is the average position of an object during its motion.
• Displacement is the total distance traveled by an object regardless of direction.

Multiple Choice

What is distance?

• Distance is the speed of an object.
• Distance is the weight of an object.
• Distance is the time taken to travel.
• Distance is the total length between two points.

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Elevator Displacement

SEP Use Models An elevator starts on the third floor of a
building. It moves up 5 floors, down 4 floors, down 1 floor,
up 3 floors, and down 2 floors. Enter a square or type an
X in each column of the chart to show the elevator’s
movements. What is its final position?

8

The elevator
ends on the

floor.

7

6
5

4

3
2

1

Draw

Use the drawing option to indicate what floors the elevator stopped on and figure out what floor did the elevator end on? Write your answer beside the graph.

Multiple Choice

What floor did the elevator stop?

• 3rd floor

• 2nd floor

• 5th floor

• 4th floor

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Elevator Displacement Answers

SEP Use Models An elevator starts on the third floor of a
building. It moves up 5 floors, down 4 floors, down 1 floor,
up 3 floors, and down 2 floors. Enter a square or type an
X in each column of the chart to show the elevator’s
movements. What is its final position?

8

X

7

6

X

5

4

X

X

3

X

2
1

The elevator
ends on the
fourthfloor.

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What is speed?

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What is speed? continued

Speed = distance ÷ time

Speed is the ratio of distance
traveled to the amount of time
taken to travel the distance. It
is measured in units such as
miles per hour or meters per
second. Speed may be
constant, or it may vary.

Multiple Choice

What is the correct formula for speed?

• Speed = Time / Distance
• Speed = Distance + Time
• Speed = Distance / Time
• Speed = Distance x Time

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Slower and Faster

SEP Interpret The lizard moved 5 meters in 5
seconds. The turtle moved 5 meters in 10 seconds.
The frog moved 10 meters in 5 seconds. Use what
you know about time, distance, and speed to sort
the animals from slowest (1) to fastest (3).

Match

Use the information to calculate the speed of each animal and sort them from slowest 1 to fastest 3.

• Lizard

• Turtle

• Frog

2nd

1st

3rd

• 2nd

• 1st

• 3rd

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Slower and Faster Answers

SEP Interpret The lizard moved 5 meters in 5
seconds. The turtle moved 5 meters in 10 seconds.
The frog moved 10 meters in 5 seconds. Use what
you know about time, distance, and speed to sort
the animals from slowest (1) to fastest (3).

2

1

3

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Copyright © Savvas Learning Company LLC. All Rights Reserved. Savvas is not responsible for any modifications made by end users to the content posted in its original format.

Multiple Choice

What is velocity?

• Velocity is speed and direction of an object's motion.

• Velocity only measures distance.

• Velocity only refers to the speed of an object.
• Velocity is the same as speed.

Multiple Choice

What is uniform motion?

• Same as velocity.

• Same as speed.

• Same as displacement.

• Same as constant speed.

Multiple Choice

Sara walks from Point A to Point B. Which is true?

• Distance and displacement are EQUAL
• Distance is less than displacement and not equal.

Multiple Choice

Suzie goes from Home to shopping to lunch to the movies to the gas station. What was her DISPLACEMENT to where she started and stopped?

• 5 miles

• 13 miles

• 4 miles

• 8 miles

Multiple Choice

Find the distance Sara walks from A to B,  B to C then C to D?

• 11m
• 3m
• 5m

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Making Sense of Velocities DOL

Explain Write an explanation for the sentence in the box provided.

Objects A, B, and C are all moving at the same speed.

However, A and B are moving apart at 10 m/s, while A and

C are not moving at all. Explain what is going on and give

the velocity of each object.

Open Ended

Objects A, B, and C are all moving at the same speed. However, A and B are moving apart at 10 m/s, while A and C are not moving at all. Explain what is going on and give the velocity of each object.

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Making Sense of Velocities Answers

Explain Write an explanation for the sentence in the box provided.

Objects A and B have velocities in opposite directions. A has

velocity of +5 m/s, B has a velocity of –5 m/s, and object C is

moving at the same velocity as object A, +5 m/s.

Objects A, B, and C are all moving at the same speed.

However, A and B are moving apart at 10 m/s, while A and

C are not moving at all with respect to each other. Explain

what is going on and give the velocity of each object.