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1
Chap 5
Force and motion 1
Note – this is an outline of the lecture, print this
and take notes on it in lecture It is not the
and take notes on it in lecture. It is not the
complete lecture.
You should attend lecture to
get the complete notes
Images taken from Halliday/Resnick/Walker,
Fundamentals of Physics, 7
th
Edition, John Wiley
and Sons Inc., by permission.
Hints
Draw free body diagrams and show clearly labeled
forces.
Show clearly your chosen xy axes!
P11. a)
The forces on disc A are the tension in the cord
above it, the tension T
1
and the weight force.
Draw a
free body diagram for
m
A
and apply Newton’s 2
nd
law.
P21
.
Draw a free body diagram of the firefighter.
The
pole exerts a force on the firefighter and gravity exerts
a force on the firefighter.
Apply Newton’s 2
nd
law.
For parts c) and d) think about Newton’s 3
rd
law.
P24.
The forces on the box are the normal force, the
horizontal applied force F, and the weight force.
Draw
a free body diagram and apply Newton’s 2
nd
law.
Hintscontinued
P43a).
Find the acceleration from Newton’s 2
nd
law by
taking both
m
1
+
m
2
to be the system. Now take block 1
to be the system, draw a free body diagrams for it. Apply
Newton’s 2
nd
law to block 1.
P45a)
When you include all m’s in your system, the
tensions T
1
and T
2
are internal forces that do not enter
into Newton’s
second law.
P50
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 Spring '08
 oshea
 Force

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