Speed and Acceleration

Vocabulary

Definition Illustration

3 Examples 3 Non-examples

VocabularyWord

• Speed• Velocity• Acceleration

What is Speed?• The distance an object travels in a certain

amount of time.

How do you calculate Speed?• Speed is calculated by dividing the

distance the object traveled by the time it took to travel that distance.

Distance • Speed = Time

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Critical Thinking - SpeedYou will drive to a town that is 100km away. Half the trip you will be able to drive 100km/h (on the highway) and half the trip you will drive 50km/h (going through small towns). How long will it take you to get there? Show your work!

My How Times Have Changed!

Speed:• Speed = Distance/Time

• What are two ways to increase speed?

(Hint: Remember Newton’s 2nd Law!)

• Let’s make up some distance and time values and calculate speed.

Speed:• Speed = Distance/Time

• Let’s make up some distance and time values and calculate speed.

• What are two ways to increase speed.

(Hint: Remember Newton’s 2nd Law!)

CITY DISTANCE CITY DISTANCE CITY DISTANCE

Albany NY 1014 EL Paso TX 1426 Norfolk VA 557

Albuquerque NM 1406 Fargo ND 1369 Oklahoma City OK 562

Baltimore MD 673 Grand Junction CO 1660 Omaha NE 1000

Billings, MT 1980 Hartford CT 1000 Orlando FL 440

Birmingham AL 148 Houston, TX 797 Philadelphia PA 816

Boise ID 2184 Indianapolis, IN 529 Phoenix AZ 1562

Boston, MA 1100 Jackson Ms 383 Pittsburgh PA 656

Buffalo NY 896 Jacksonville FL 346 Portland ME 1229

Charleston SC 321 Kansas City, MO 810 Portland OR 2604

Charleston WV 503 Las Vegas NV 1984 Rapid City SD 1521

Charlotte, Nc 242 Little Rock AR 531 Reno NV 2406

Cheyenne WY 1450 Los Angeles CA 2205 St. Louis Mo 556

Chicago, IL 712 Louisville KY 415 Salt Lake City UT 1883

Cleve land OH 715 Memphis TN 393 San Antonio TX 992

Columbia Sc 213 Miami FL 661 San Diego CA 25154

Columbus OH 574 Milwaukee WI 811 San Francisco CA 2503

Dallas, TX 791 Minneapolis MN 1132 Seattle WA 2675

Denver, CO 1415 Nashville TN 242 Washington DC 635

Des Moines IA 961 New Orleans LA 468 Wichita KS 972

Detroit, MI 723 New York NY 896

Distance from Atlanta, GA to other US Cities   

What is Velocity?• Is both speed and direction.• 40 km/hr = speed• 40 km/hr west = velocity• Can change velocity two ways

– Change speed– Or change directions

What is Velocity?Calculate the total

velocity

for each of the

passengers.

Airplane: 800km/h west

4km/h west5km/h east

0km/h west

• What information must you know in order to calculate speed?

• What is the error in the following statement:– The velocity of the car is 55km/hr.

Quick Review

How can motion be shown on a graph?

• You can show the motion of an object on a line graph in which you plot distance versus time.

• The slope of the graph tells you whether the object is moving fast, slow, or even at all.

How can motion be shown on a graph?

700

600

500

400

300

200

100

0 1 2 3 4 5 6 7

Dis

tan

ce

(k

m)

Time (h)

Graph showing the speed of a car

---- Car 1

---- Car 2

1. Which car is faster? Support your answer with data from the graph.

Speed Graph: The distance a runner traveled in 7 minutes.

• How far does she travel in 5 minutes?

• Is her speed constant?– How do you

know?

Distance-Time Graphs

Graph A: Graph B: Graph C:

Distance-Time Graphs

• Distance-time graph– The following graph shows the distance Kyle traveled on

his bicycle trip and the amount of time it took him to travel that distance.

• During which 5-minute interval did Kyle achieve the greatest average speed?

• What may have happened between t = 10 and t = 15 minutes?

Ticket out the door!

1. What is speed?

2. What do you know about the motion of an object that has an average speed of 1 m/s?

3. What is the difference between speed and velocity?