Young’s Modulus Lab
Physics 103A-001
Mohammad Ihsan
1/31/17
Professor Huang

Objective
The goals of this lab were to determine Young’s Modulus of elasticity of a thin wire by
stretching.
Background
In this experiment, we were going to observe how the deformation of a body by a force is
proportional to the magnitude of the force, which is Hooke’s law, can be applied to Young’s
Modulus by finding the elasticity with the ratio of tensile strength to tensile strain. The main
equations that we used to do this experiment were
Stress
=
F
A
,
Strain
=
∆ L
L
. By dividing
the stress by the strain (
Stress
Strain
¿
, we would get a constant what’s known as Young’s Modulus
Elasticity (Y). This constant depends on the material from which we make the wire. Since the
ratio of tensile stress to tensile strain yields Young’s Modulus Elasticity, we can plot a Stress vs.
Strain graph and obtain the Young’s Modulus Elasticity value from the slope.
Experimental Procedure
We first had to use the bubble level to make sure that that the three legs of the apparatus were
equal. Then we attached the 1 kg weight pan on the string and adjusted the micrometer screw to
make the bubble to the center of the level and record the reading of the micrometer, which was
our L
1
. After that we used a ruler to measure the length of the string and used a micrometer to
measure the diameter of the string. Now that everything was measured, we were now able to add
7 1 kg weights one by one and adjust the bubble back to the middle and record the reading of the

micrometer screw. Each time we added weights, we had to adjust the bubble and record the new

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