TA: Tomoyuki Nakayama
March 22
nd
– March 23
rd
, 2010
PHY 2048: Physics 1 with Calculus, Spring 2010
Review: Chapter 12.112.7
The purpose of this review is to refresh your memory. Physics is a cumulative subject, so make it
sure that you understand basic concepts and typical problem solving techniques in previous chapters
before moving on to a new chapter.
________________________________________________________________________________
A . Requirements of Equilibrium
Which of the four disks in the right figure are in equilibrium?
B. Rigid Bodies in Equilibrium
A uniform ladder is 5 m long and weighs 200 N. The ladder leans against a vertical,
frictionless wall at height 4 m. A horizontal force
F
is applied to the ladder at
distance
d
= 1 m from the base. The base slips to the right if the force is larger than
or equal to 250 N. Find the coefficient of static friction.
In the figure below right, what magnitude of constant force
F
is necessary to raise the wheel over an
obstacle of height
h
= 10 cm? The wheels radius is
r
= 20 cm, and its mass is
m
= 2 kg.
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 Fall '08
 Field
 Physics, Center Of Mass, Force, Mass, Shear Stress, Shear modulus, Tomoyuki Nakayama

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