Speed and Velocity

James Martin Middle School Mrs. Anna Ward

DO NOW!!!! In the formula: S = D/T, what does the:

S stand for? D stand for? T stand for?

Calculate the answers using the formula S = D/T:1. A bicyclist travels 60.0 kilometers in 3.5 hours. What

is the cyclist’s average speed?

2. How much time would it take for the sound of thunder to travel 1,500 meters if sound travels at a speed of 330 m/sec?

3. A comet is cruising through the solar system at a speed of 50,000 kilometers per hour for 4 hours time.

Announcements

The Quiz scheduled for tomorrow has been moved to Friday

Agenda Average Speed vs. Instantaneous Speed

Speed vs. Velocity

Choral Response: Speed and Velocity

Speed practice problems

Racecar lab on Speed

Average Speed Instantaneous Speed

Average Speed is the total distance divided by the total time, the average of all the speeds during a given time

Think about it….if you drive to school from your house, do you travel at the same time for the entire trip?

However, in science class we will use the average speed for our calculations

Your moment-to-moment speed

The speed at any given moment

What the “SPEED LIMIT” is based off of

What is velocity?

Velocity is speed with direction

Speed versus Velocity

http://www.youtube.com/watch?v=DRb5PSxJerM

Speed vs. Velocity—Choral Response

Speed is distance over

time; Velocity adds in

direction

CFUs:1. What is speed + direction?2. Ms. Lusk’s room is 20 meters from my room.

Duante went to take a textbook to her room and it took 20 seconds to get there. What was his speed?

3. The baseball field is 300 meters away. Alfie is really late to practice, so it only took 60 seconds to get to to the field. What was his speed?

4. What is the formula for speed?5. What is the formula for velocity?6. Ramiro took his dog for a walk around the block.

It took him 5 minutes to travel 1 km.

More CFUs:6. Kaleeha walks at a rate of 1.5 m/s. She needs to

go from Mrs. Ward’s room to the office to pick up a form. It takes her 240 seconds to get to the office and back. How far did she walk?

7. How far is the office from Mrs. Ward’s room?8. Dianelys runs during soccer practice for every

day after school. She runs the length of the field many times at every practice. If Ms. Bickett times Dianelys running at a rate of 2.5 m/s for 400 meters, how long does she run?

9. What is the name for the location of a place or thing?

10. What is another name for change in position?

Race Car Lab We are using the same tape marks as Monday

(2 m)

Students with stopwatches will be team captains

Please use your quiet partner voices and remember to exceed expectations

EXIT TICKET Mr. Rudolph lives 16 km from James Martin

Middle School. If he drives at an average speed of 2 km/minute, how long will it take him to get home?

Mrs. CVT has a meeting at the CMS Central Secondary Office. If it takes her 20 minutes to get there and she drives at an average rate of 1 km/minute, how far is the office?