1. Acceleration
First…let’s review…

2. Speed is the rate at which an object changes position…
SLOW SPEED (10 m/s)
FAST SPEED (20 m/s)

3. Which equation do we use???
t=d/s
s=d/t
d=s⋅t

4. The trick of the triangle…d s t

5. The trick of the triangle…
Cover up the variable you are solving for… d s t
d =
s⋅t

6. The trick of the triangle…d s t
s =

7. The trick of the triangle…d s t
t =

8. Now try this…

9. Velocity is speed and direction…
SMALL VELOCITY (10 m/s to the right)
LARGE VELOCITY (20 m/s to the right)

10. Why does direction matter?
Let’s go to the beach!
20 m/s East
20 m/s West
Who will reach the beach first?
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11. How do we change velocity?
1) Speed up
2) Slow down
3) Change directions

12. Your turn….

13. Forces
A force is a…
…or a…

14. Forces Balanced forces Unbalanced forces
No change in motion
Constant speed in a straight line
Unbalanced forces
Change in motion
Speed up, slow down, or change directions

15. Your turn…

16. Changing velocity is called
ACCELERATION (a)
Speeding up, slowing down, or changing directions…

17. Answer these questions…

18. Examples of things accelerating…
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