7.1 Vectors as Forces Part One.notebook
1
September 23, 2009
A
force
is something that pushes or pulls an object.
On Earth,
force
is defined as the product between the mass of
an object and the acceleration due to gravity (9.8 m/s
2
).
A 1 kg mass exerts a downward force of 1 kg x 9.8 m/s
2
,
or 9.8 kg m/s
2
, or 9.8 N (
1 N = 1 kg m/s
2
)
Chapter 7: Application of Vectors
7.1 Vectors as Forces (Part One)
When we are trying to determine the direction that an object
moves (or if it moves at all!) we must know both the magnitude
and direction of the forces acting on it... therefore it makes sense
to use vectors to describe forces.
Recall:
F = ma,
(where F = force, m = mass in kg, and a = acceleration)
When using vectors to represent a situation involving forces,
there are two different representations we can use:
Position Diagram
vs.
Vector Diagram
eg#1. Mason pulls on a rope with a force of 70 N at 30
o
to the
ground. Jennie pulls horizontally with a force of 45 N.
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 Spring '13
 N/A
 1 kg, Vertical market, Jennie, 110 km, 9.8 kg

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