Newton’s Laws and Free-Body Diagrams (4A)
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QUESTION
Find
f
k
f_k
f
k
if
μ
k
=
0.20
\mu_k=0.20
μ
k
=
0.20
and
N
=
60
N
N=60\ \text{N}
N
=
60
N
.
QUESTION
A hanging
3
kg
3\ \text{kg}
3
kg
mass is at rest on a rope. What is the tension magnitude using
g
=
10
m
⋅
s
−
2
g=10\ \text{m}\cdot\text{s}^{-2}
g
=
10
m
⋅
s
−
2
?
QUESTION
A
10
kg
10\ \text{kg}
10
kg
crate is pulled with
50
N
50\ \text{N}
50
N
right; kinetic friction is
20
N
20\ \text{N}
20
N
left. Find
a
a
a
.
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ANSWER
a
=
3
m
⋅
s
−
2
a=3\ \text{m}\cdot\text{s}^{-2}
a
=
3
m
⋅
s
−
2
right. Net force is applied force minus opposing friction, then acceleration is net force over mass.
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