1.
To put it in
reverse or put it in drive so it can go a different direction and change in velocity. You can also just turn around and go the other way or slow down.
2.
a) Acceleration:
The rate at which an object changes its velocity.
b)
Deceleration: Acceleration that is opposite to the direction of motion.
3. It occurs when the speed of an object
changes, or it’s direction of motion changes, or both. Changes in velocity can
be either positive or negative. To find the velocity you have to subtract the
initial by the final velocity.
4.
Velocity = (+ 20 m/s) – (+ 0 m/s) =
+ 20 m/s
5. They both can be the same if two objects or
something goes at the same speed, but if the acceleration is greater the
velocity can change faster than something have a lower acceleration.
6. a) Negative
b)
Zero
c)
Positive
d)
Positive
e)
Negative
7. a) (+ 8 m/s) – (+ 0 m/s) = + 8 m/s
b) (+ 12 m/s) – (+ 8 m/s) = + 4 m/s
c) (+
12 m/s) – (+ 12 m/s) = 0 m/s
d) (+
15 m/s) – (+ 12 m/s) = + 3 m/s
e) (- 9
m/s) – (+ 15 m/s) = - 24 m/s
8. a) The
speed of an object increases.
b) The
speed of an object decreases.
9. a) (+ 25
m/s) – (- 4 m/s) = - 29 m/s
b) The
direction of the cars acceleration is negative or backwards the opposite of the
direction it was travelling at the start.
10. a) He is moving forward so he has a positive
acceleration, since he started at home plate and made it back there by running
at a constant speed moving forward in a circle.
b) The car
is moving forward so it is positive, since it just started the race.
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