4. Do Now: What is the speed of an object that is standing still?
Objective: to define and calculate speed.

5. Time….
It can mean either a moment in time like when you ask, “What time is it?” OR….
It can mean a quantity of time, for example how long did something take to occur? We use the second (sec) as our basic unit of time.

6. Speed & constant speed
What is the difference? What do we mean by the word constant?
Speed describes movement from one place to another over time; we say it’s the distance divided by time.
Constant speed is a maintained speed that does not change. This means the same distance is traveled every second.

7. Three different units you could use.
Now it’s your turn…
With your table partner, come up with 3 variations for the formula for speed AND
Three different units you could use.

8. Why do we use v?
V stands for velocity, which indicates that you know direction as well as speed.

9. What are the units? Meters per second Kilometers per hour
Centimeters per second
Miles per hour
Inches per second
Feet per minute

10. Now let’s practice Calculating… Work with your partner to solve
What is the average speed of a car that traveled miles in 5.5 hours?
A bicyclist, traveling at 22 miles per hour, rides a total of 44 miles. How much time, in hours, did it take?
How far can a person run in 15 minutes if he or she runs at an average speed of 16km/hr? Hint make sure your time is in the same units!
You ride your bike for a distance of 30 km. You travel at a speed of 0.75 km/minute. How many minutes does this take?

11. Answers:
speed = distance / time….
300 miles/5.5 hours =
Time = distance /speed
44 miles/22 miles/hour
3. Distance = speed * time
15 minutes * 1 hour/60 minutes = 0.25 hours
16 km/hour * 0.25 hours =
30 km / 0.75 km/minute

12. What did we learn??? What do we mean by the term constant speed?
What are the variables when calculating speed?