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- 1. Multiple-choice45 seconds1 pt
The final velocity of an object undergoing free fall from rest is proportional to
xx
( x)
( x)^2
- 2. Multiple-choice45 seconds1 pt
An object in free fall
experiences an increase in speed of 9.81 m/s during each second.
moves only downward.
undergoes a velocity decrease of 9.81 m/s during each second.
all of the above
- 3. Multiple-choice45 seconds1 pt
The graph above shows the motion of four objects. Which of the following lines represent an object in free fall? Assume positive velocity is upward.
I only
II only
I and III
I and IV
- 4. Multiple-choice45 seconds1 pt
An object in free fall
experiences no air resistance.
undergoes a downward acceleration.
has an acceleration with a magnitude of 9.81 m/s2 near Earth’s surface
all of the above
- 5. Multiple-choice45 seconds1 pt
The displacement of an object undergoing free fall from rest is proportional to
t.
t.
( t)^ 2
(2t)^2 .
- 6. Multiple-choice45 seconds1 pt
Questions 6–8 refer to the following demonstration.
A red ball is dropped from rest and undergoes free fall. One second later a blue ball is dropped from rest and undergoes free fall.
The red ball’s change of velocity during the third second of the demonstration is v. What is the change of velocity of the blue ball during this time interval?v
v
2 v
3 v
- 7. Multiple-choice45 seconds1 pt
A red ball is dropped from rest and undergoes free fall. One second later a blue ball is dropped from rest and undergoes free fall.
The red ball’s velocity at the end of 3.0 seconds is v3. What is the blue ball’s velocity at this moment of the demonstration?
v3
v3
v3
v3
- 8. Fill-in-the-Blank3 minutes1 pt
A climber throws a rope with a velocity of 3.0 m/s downward to another climber 4.0 m directly below. What is the rope’s velocity when it reached the lower climber? Assume no air resistance and that a = g = 9.81 m/s2.
- 9. Open-ended5 minutes1 pt
Describe the motion of the graph in your own words. Use complete sentences..
- 10. Multiple-choice45 seconds1 pt
A red ball is dropped from rest and undergoes free fall. One second later a blue ball is dropped from rest and undergoes free fall.
The displacement of the blue ball during the time interval 3.04.0 s is equal to the displacement of the red ball in which of the following intervals of the demonstration?
0.0-1.0 s
1.0-2.0 s
2.0-3.0 s
3.0-4.0 s
