Chapter 3 Review ?’s
1) Can acceleration be negative when velocity is positive? Yes, moving forward but slowing down
2) Can acceleration be non-zero when ‘v’ is zero?
Yes, when an object is thrown upwards… at its highest
point
3)
What is v? 12m/s
what is Δx? 96m
what is a? 3m/s2
24
v
8
4)
5)
Can acceleration be non-zero when ‘v’ is constant? No
P
is acceleration positive or negative? Positive
6) What is slope on a p-t graph equal to? velocity
7) What is slope on a v-t graph equal to? acceleration
8) Throw something and let it come back down…..
a. What is v at the top? 0
b. What is a at the top? -9.8 m/s2
9) For p-t graph below Is acceleration positive or negative? positive Is velocity positive or negative at all
points? positive
10) In what type of situation would average velocity be equal to vi and vf? if velocity was constant
11) At what point on the below v-t graph did the object turn around?
When the graph crossed the x-axis
12) If an object was speeding up as it went from a position of xi=5 to xf=-2 would its acceleration be positive or
negative? negative
13) What would an a-t graph of an object in free fall look like? Horizontal line under the x-axis
14) If an object is in free fall did it travel as much distance in the 4th sec of fall as it did in the 2nd? No, travelled
more in the 4th second
15) An object launched up from the ground at 35m/s….. how long would it take to get to its highest point? 3.5 s
a. What speed would it hit the ground with? 35 m/s What was ‘a’ at its highest point? -9.8 ~ 10 m/s2
16) For v-t graph below is Δx positive or negative? positive
a. At any point is the object moving in negative direction? no
17) For this p-t graph Is acceleration constant….. where is it + and where is it - ? Positive then negative then
positive
18) Object thrown down from a cliff at 5m/s.
a. What is its acceleration one sec later? -9.8 m/s2
b. What is its velocity one sec later? -14.8 m/s
19) Object thrown up at 20 m/s
a. What is its ‘a’ one second later? -9.8 m/s2
b. What is its ‘v’ one second later? 10.2 m/s
20) Draw the following v-t graph as a p-t graph….
20 Draw the following p-t graphs as v-t graphs
21) If an object has a negative velocity and a negative acceleration does that mean its speeding up or slowing
down? Speeding up
22) What is the acceleration of the following v-t graph? zero
23) Can an object change directions while having a constant non-zero acceleration? yes
24) Can an object have a constant speed while having a non-zero acceleration? Yes, if it is changing directions
25) Can an object have a position that is becoming more positive while it has a negative acceleration? Yes, if it is
slowing down but still moving in the positive direction
26) Which segment of the p-t graph is the object moving the fastest? the 3rd
27)
p
15
What is v from 0s to 5 s?
5
2 m/s
What is v from 5 to 10 s?
5
10
0 m/s
What is Δx from 0-5 s?
10 m