MasteringPhysics: Assignment Print View
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PHCC 141: Physics for Scientists and Engineers I  Fall 2007
2a. One Dimensional Kinematics
Due at 11:59pm on Thursday, August 30, 2007
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Number of answer attempts per question is:
5
You gain credit for:
correctly answering a question in a Part, or correctly answering a question in a Hint.
You lose credit for:
exhausting all attempts or requesting the answer to a question in a Part or Hint, or incorrectly answering a question in a Part.
Late submissions:
reduce your score by 100% over each day late.
Hints
are helpful clues or simpler questions that guide you to the answer. Hints are not available for all questions. There is
no penalty
for leaving questions in Hints unanswered.
Grading of
Incorrect Answers
For
MultipleChoice
or
True/False
questions, you lose
100%
/
(
# of options  1
)
credit per incorrect answer.
For
any other
question, you lose 3% credit per incorrect answer.
NOTE: Beginning with this assignment you will have only 5 wrong answer attempts and the past deadline ramp down of credit is 24
hours past due.
Ball on a Segmented Ramp
A ball is set rolling on the track shown.
At
it is released at the very left of the track with velocity
to the right. It reaches the
evenly spaced positions
at later times
.
Part A
Given that the spatial intervals between the various
are equal, it is clear that the time intervals
,
, etc. will
probably not be. Which ordering would be possible for these intervals?
Hint A.1
How to approach the problem
Use your intuition. You know that as a ball rolls down a ramp, its speed increases, and a a ball rolls up a ramp, its speed
decreases. You also know that the faster the ball is traveling, the less time it will take to cover a given distance.
ANSWER:
Parts B, C, and D all refer to the graphs labeled a through f.
Part B
Select from the graphs pictured the one that most plausibly represents the graph of
x
position vs. time.
Hint B.1
How to approach the problem
Hint not displayed
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MasteringPhysics: Assignment Print View
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Part C
Select from the graphs pictured the one that most plausibly represents the graph of
x
velocity vs. time.
ANSWER:
a
b
c
d
e
f
Correct. First the ball moves with constant speed. Then, as it rolls down the ramp, its speed increases linearly. The ball
encounters another flat section, and its speed is once again constant. Finally, as the ball rolls up the ramp, it decelerates.
Part D
Select from the graphs pictured the one that most plausibly represents the graph of
x
acceleration vs. time. (Note that the origin
of the
y
axis of the graphs is arbitrary; zero acceleration is not necessarily at the bottom of the graphs.)
ANSWER:
a
b
c
d
e
f
Correct. Initially, the ball's acceleration is zero. When the ball rolls down the first ramp, its acceleration becomes positive
and constant. When the ball encounters the second flat section, its acceleration is once again zero. Finally, as the ball rolls
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 Physics, Acceleration, Velocity, International Space Station, Assignment Print View, Incredible Motors, Inc.

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