Online Lab 3: Vector Addition
Amy Dixon
Phys-2125-10643
DUE DATE: 9/05/2020

OBJECTIVES
When several forces passing through the same point, act on an object, they may be replaced by
a single force which is called the resultant or the sum. The resultant therefore is a single force
which is similar in effect to the effect produced by the several forces acting on the body. It is
therefore a single force that replaces those forces. The objectives of this lab are to use graphical,
analytic and experimental methods to:
1. Resolve a force vector into its rectangular components, and
2. To find the resultant of several forces acting on a body.
Equipment
1. Force table
5. Strings for suspending the masses
2. Four weight holders
6. A ring
3. Four pulleys
7. A metal pin
4. Slotted weights
8. A protractor
9. A compass
10. Sheets of plain or graph paper.
11. Ruler
THEORY OF VECTOR ADDITION
A.
Graphical Methods
Parallelogram Method
Vectors are represented graphically by arrows. The length of a
vector arrow (drawn to scale on graph paper) is proportional to
the magnitude of the vector, and the arrow points in the
direction of the vector. The length scale is arbitrary and usually
selected for convenience so that the vector graph fits nicely on
the graph paper. See Fig 1a, where
R
=
A
+
B
. The magnitude
R