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Chapter 5: Applying Newton’s Laws
In this chapter we apply Newton’s laws to
solving problems in
statics
and
dynamics
We’ll also consider particular types of forces,
notably
friction
Example 5.1  One dimensional equilibrium
A gymnast has just begun climbing up a rope hanging from a gym ceiling.
She stops, suspended from the lower end of the rope by her hands. Her
weight is 500 N, andthe weight of the rope is 100 N. Analyze the forces on
the gymnast and on the rope.
at the ceiling
statics
Example 5.2  Two dimensional equilibrium
In the figure a car engine with weight
w
hangs from a chain that is linked at a
point
O
to two other chains, one fastened to the ceiling and the other to the
wall. Find the tension in each of the three chains, assuming that
w
is given
and the weights of the chains and negligible.
statics
Example 5.3  Car on a ramp
A car with weight 1.76 x 10
4
N rests on the ramp of a trailer. The car’s brakes
and transmission lock are released; only the cable prevents the car from rolling
backwards. The ramp makes an angle of 26.0
o
with the horizontal. Find the
tension in the cable and the force with which the ramp pushes on the car’s tires.
statics
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Example 5.6  Acceleration down a hill
A toboggan loaded with vacationing students (total weight
w
) slides down a
long, snowcovered slope. The hill slopes at a constant angle
, and the
toboggan is so well waxed that there is virtually no friction at all. Find the
toboggan’s acceleration and the magnitude
n
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 Spring '08
 Sukenik
 Physics, Force, Friction, Robert Hooke

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