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1
Chapter 5
Force and Motion
¾
Begin the study of dynamics
¾
Newton’s First Law
¾
Newton’s Second Law
¾
Newton’s Third Law
2
Newton’s First Law
The velocity of a body will not change unless it is acted
upon by a force.
If several forces act on a body (say
,
, and
) the net force
is defined
Note:
as:
AB
C
n
e
t
FF
F
F
GG
G
G
net
A
B
C
=++
F FFF
G GGG
F
a
o
m
o
Mass:
Mass is an
intrinsic
characteristic of a body that
relates a force
F
applied to the body to the resulting
acceleration a
.
3
4
If a spaceship in deep space turns off its
engines, will it coast to a stop?
b) Yes, it will slow down and stop just like
a car does.
a) No, it will coast forever.
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F
net
a
m
Newton’s Second Law
The net force on a body is equal to the product
of the mass of the body and its acceleration.
In equation form Newton’s second law can be written as:
net
m
=
Fa
G
G
6
()
2
2
s
m
kg
s
m
kg
⋅
=
SI Unit for Force
This combination of units is called a
newton
(N).
2
ft
pound
slug
s
=
7
F
g
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This note was uploaded on 10/18/2011 for the course PHYS 101 taught by Professor Cohen during the Spring '10 term at Pittsburg State Uiversity.
 Spring '10
 Cohen
 Physics, Force

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