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3. Speeding Up & Slowing Down
•An object that speeds up
is accelerating

4. An object that slows down is decelerating

5. •The acceleration of an object can be positive or negative, depending on
whether the object is speeding up or slowing down
• If an object is speeding up, its acceleration is positive
• If an object is slowing down, its acceleration is negative (sometimes
called deceleration)

6. Velocity and Acceleration Positive

7. Velocity Positive and Acceleration Negative

8. Velocity Negative and Acceleration Positive

9. Velocity and Acceleration Negative

10. In which motion is
the direction sign
for velocity
negative but
acceleration
positive?

11. Comparing Acceleration, Velocity, and Displacement
•Acceleration is how much velocity is changing in a direction
•Velocity is how fast you are moving in a direction
•Displacement is how far you traveled in a direction
•Time is how long it took

12. Most Common Acceleration
Equation

15. What is your acceleration from rest if it takes you 2 seconds to get to 10 m/s

16. • A car accelerates from a traffic light and increases its velocity from 0 m/s
to 20 m/s in 5 s. What is its acceleration?

17. Notice there are five total
variables in these equations
vi vf a x t

18. What is the initial velocity of a train that takes 30 m to get to 15
m/s from at a rate of 2 m/s2?

19. What is the initial velocity of a train that takes 30 m to get to 15
m/s from at a rate of 2 m/s2?
Givens
vi = ?
x = 30 m
vf = 15 m/s
a = 2 m/s2

20. What does the following tell us about certain variables or ask for?
A) How fast was it going?
vi = ?

21. How fast will it go?
vf = ?

22. Object starts from rest
vi = 0 m/s

23. Object slows down
a = negative

24. Object comes to a stop
vf = 0 m/s

25. At a constant velocity
a = 0 m/s2

26. How fast was Chancellor running after starting from
rest and accelerating at 4.5 m/s2 for 2 seconds?

27. How fast is Tommy Running after starting
from rest and accelerating at 2 m/s2 for
three seconds?

28. A car travels for 10 seconds at a constant velocity of 20 m/s. What is its
acceleration over that ten second period?
0 m/s2
Constant Velocity Means No Acceleration

29. How much time would it take to go from 10 m/s to 35 m/s in
50 meters?

30. How much did you accelerate when starting from rest and traveling 230 meters
in 15 seconds?

31. How far would you have traveled after starting from 2 m/s and speeding up to 12
m/s at 3 m/s2?