Experiment4
I.
Objective:
(write at home) Experimental measurement of the shear modulus.
I.I
Theory:
(write at home) Please follow the labmanual to understand:
Shear modulus,
(1)
Fig. 1: Setup for the experiment and parameters need to find.
I.II
Measurements:
Measure the parameters described in #2 in the labmanual at pp. 57.
Table1
Hanging Mass (unit)
Angle,
(Unit)
;
(you may see e.g.
)




Make sure you know how to get
and also
.
Twist angle,
𝜓
6
?𝑎𝑦
???
?
0
?
12 20


Hanging mass, m= 0, 20g, 40g 
𝑹
𝑹
𝐿
𝑳
𝒅
𝟐
𝒓
;
𝑭𝒊𝒏𝒅
𝒓
𝒓
d
Pulley
Disc
Wire
(1)
Do you know the direction of the force
applied?
(2)
Do you know the magnitude of the
torque applied at the centre of the disc
which makes the twist of the wire?
(3)
Do you know the direction of the
torque?
Think, Read at the bottom of this handout and
also ask me during the demonstration.
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Fig. 2
I.III
Calculation:
We use the equation (1) to find:
Shear modulus,
Also,
Do you know, why we multiply
by 4 in the above error equation?
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 Spring '11
 MARKO
 Physics, Force, Mass, Rotation, Shear modulus

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