®
M o d e l N o . M E - 9 5 0 2
E x p . 4 : T o r q u e — P a r a l l e l F o r c e s
0 1 2 - 1 2 8 7 6 B
21
Exp. 4: Torque—Parallel Forces
Equipment Needed
Theory
In experiment 2, you found resultants and equilibriants
for concurrent forces—forces that act upon the same
point. In the real world, forces are often not concurrent.
They act upon different points on an object. In the fig-
ure, for example, two forces are pulling on different
points of an object. Two questions can be asked:
1.
In which direction will the object be accelerated?
2.
Will the object rotate?
If the two forces were both applied at point
A
, the resultant would be the force vector shown,
F
R
. In fact,
F
R
points
in the direction in which the object will be accelerated. (This idea will be investigated further in later experiments,)
What about question 2? Will the object rotate? In this experiment you will begin to investigate the types of forces
that cause rotation in physical bodies. In doing so, you will encounter a new concept—torque.
Setup
Mount the Balance
Arm near the center of
the Statics Board.
Level the Beam
Loosen the thumbscrew and adjust the beam so that the zero mark on the beam is aligned with the indicator marks
on the pivot. When the beam is level, the bubble in the bubble level will be midway between the two lines on the
level.
Add the Protractors
First, find the mass of two
of the protractors and
record the masses. (Note
that you can use the Spring
Scale to measure the mass.)
•
Protractor 1 =
__________
•
Protractor 2 =
__________
Loosen the thumbscrews on the two protractors and slide one onto each end of the beam. Tie a mass hanger to the
thread on the angle indicator of each protractor.
Item
Item
Statics Board
Balance Arm and Protractors
Mass and Hanger Set
Thread
A
F
R
Figure 4.1: Non-concurrent forces
Object
F
1
F
1
Figure 4.2: Balance Arm
Base
Thumbscrew
Bubble level
Beam
Pivot
Scale
Figure 4.3: Setup
Angle
Indicator
Protractor 2
M
1
M
2
Protractor 1
Thread
Mass
hanger
Summary of Contents for ME-9502
Page 1: ... PASCO Mechanics Statics System ME 9502 Instruction Manual 012 12876B 012 12876 ...
Page 4: ... Statics System iv 012 12876B ...
Page 20: ...Statics System Exp 2 Adding Forces Resultants and Equilibriants 16 012 12876B ...
Page 24: ...Statics System Exp 3 Resolving Forces Components 20 012 12876B ...
Page 28: ...Statics System Exp 4 Torque Parallel Forces 24 012 12876B ...
Page 32: ...Statics System Exp 5A Center of Mass 28 012 12876B ...
Page 36: ...Statics System Exp 5B Equilibrium of Physical Bodies 32 012 12876B ...
Page 44: ...Statics System Exp 7 The Inclined Plane 40 012 12876B ...
Page 50: ...Statics System Static Friction on an Inclined Plane 46 012 12876B ...
Page 60: ...Statics System Exp 10 Simple Harmonic Motion The Simple Pendulum 56 012 12876B ...
Page 66: ...Statics System Exp 11A Simple Harmonic Motion Physical Pendulum 62 012 12876B ...
Page 70: ...Statics System Exp 11B Minimum Period of a Physical Pendulum 66 012 12876B ...
Page 76: ...Statics System Exp 11C Simple Harmonic Motion Beam on a Spring 72 012 12876B ...
Page 84: ...Statics System Exp 13 Simple Machines The Inclined Plane 80 012 12876B ...
Page 94: ...Statics System Technical Support 90 012 12876B ...