1. Linear Motion

2. So lots of moving is happening
Everything Moves
You are moving right now!
Our planet turn on its axis
Our planet moves around the sun
Our solar system moves around our galaxy
Our galaxy moves around the universe!
So lots of moving is happening

3. But What Are We Talking About?
Motion is relative – we describe it in relation to something else
Unless stated otherwise, when we discuss the speeds of things in our environment, we mean relative to the surface of the earth
Moving

4. What is Speed? How would you define speed?
A measure of the distance an object travels per unit of time
What do you think the formula for speed is – knowing the definition?

5. Units of Speed

6. Increase Decrease Speeding Up!
So, knowing the formula for speed, what would we need to do for distance and what for time to speed up?
Increase
Decrease

7. Constant Speed vs. Changing Speed

8. Constant Speed
The rate of change of position in which the same distance is traveled each second

9. Instantaneous Speed
If the speed of an object is changing, it might be helpful to know the object’s speed at a specific moment
Instantaneous speed- speed at a specific instant in time

10. Think!
How would the distance the car travels each second change if it were slowing down?

11. Average Speed
The total distance traveled divided by the total time taken to travel that distance

12. Math You Can Do! d = 360m T = 4s What is your average speed?
Average Speed = 360m/4s
90 m/s

13. Guess What?
Average speed is actually velocity! You already know velocity!

14. Vocabulary So Far Speed Constant Speed Instantaneous Speed
Average Speed

15. Practice!