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34.
REASONING
In each case the object is in equilibrium. According to Equation
4.9b,
Σ
F
y
= 0, the net force acting in the
y
(vertical) direction must be zero. The net force
is composed of the weight of the object(s) and the normal force exerted on them.
SOLUTION
a.
There are three vertical forces acting on the crate: an upward normal force +
F
N
that the floor exerts, the weight –
m
1
g
of the crate, and the weight –
m
2
g
of the person
standing on the crate. Since the weights act downward, they are assigned negative
numbers. Setting the sum of these forces equal to zero gives
N1
2
()
( )
y
Fm
gm
g
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This note was uploaded on 01/29/2010 for the course CALC 01:640:135 taught by Professor Soffer during the Spring '08 term at Rutgers.
 Spring '08
 SOFFER

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