Copy
of Old Prelim
Notes: In order to save paper, I have removed lots of blank space that appeared on the
actual exam. I will give you more space to do your work on your prelim. Also, I have
used some of these problems in class or on homeworks this year, but the students taking
the exam had not seen them before their prelim.
Also, the prelim this year will cover some topics relating to center of mass and
momentum, while this old prelim does not
.
I.. 5
points
Cite an example of a body that accelerates while traveling at constant speed.
2 5
points.
A heavy pendulum bob is swinging back and forth when the string
supporting it suddenly breaks. Ignoring the mass of the string and the viscosity of air,
describe and/or sketch the subsequent trajectory of the bob
if the break occurs when the
bob is (a) at its lowest point and (b) at its highest point.
"
.
(a}
I
(b)
/'
'"
3
10
points
A person of mass 50 kg is standing on a scale in an elevator.
If
the elevator
has a downward acceleration equal to
01 g, what is the reading on the scale (in
Newtons)?
4. 10
An object thrown vertically upwards flam the ground is subject to a
viscous force (proportional to its speed), in addition to gravity. Suppose it takes time t]
for the object to reach its maximum height, and tz to fall tram this point back to the
ground. Is t]
>
tz, t]
=
tz, or t]
<
tz? Explain .
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 Fall '05
 ELSER, V
 Force, Friction, Mass, Work, Velocity

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