Exam (elaborations)
Physics Assessment Test Questions And Answers Latest Update
- Course
- Physics Placement
- Institution
- University Of California - Berkeley
Physics Assessment Test Questions And Answers Latest Update
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Physics Assessment TestQuestions And Answers Latest
Update
A box is being pulled across a rough floor at a constant speed. What can you
say about the work done by friction? Answer: friction does negative work
Can friction ever do positive work? Answer: yes, because the frictional
force is in the same direction as the displacement
In a baseball game, the catcher stops a 90-mph pitch. What can you say about
the work done by the catcher on the ball Answer: catcher has done
negative work
A ball tied to a string is being whirled around in a circle. What can you say
about the work done by tension? Answer: tension does no work at all
You lift a book with your hand in such a way that it moves up at constant
speed. While it is moving, what is the total work done on the book? Answer:
Zero.
By what factor does the kinetic energy of a car change when its speed is
tripled? Answer: factor by 9. KE = 1 half mv^2
, Car #1 has twice the mass of car #2, but they both have the same kinetic
energy. How do their speeds compare? Answer: Square root of 2 v1 = v2.
KE = 1 half mv^2
Two stones, one twice the mass of the other, are dropped from a cliff. Just
before hitting the ground, what is the kinetic energy of the heavy stone
compared to the light one? Answer: twice as much
Two stones, one twice the mass of the other, are dropped from a cliff. Just
before hitting the ground, what is the final speed of the heavy stone compared
to the light one? Answer: the same
A child on a skateboard is moving at a speed of 2 meters per second. After a
force acts on the child, her speed is 3 meters per second. What can you say
about the work done by the external force on the child? Answer: positive
work was done
A car starts from rest and accelerates to 30 mph. Later, it gets on a highway
and accelerates to 60 mph. Which takes more energy, the 0-30 mph or the 30-
60 mph? Answer: 30-60 mph
Is it possible for the kinetic energy of an object to be negative? Answer: no
You and your friend both solve a problem involving a skier going down a slope,
starting from rest. The two of you have chosen different levels for y = 0 in this
problem. Which of the following quantities will you and your friend agree on?
Answer: skier's change in PE and the skier's final KE
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