LAB 8
Simple Harmonic Motion & Hooke’s Law
PURPOSE
The purpose of this lab is to better understand Hooke’s Law and simple harmonic motion.
Simple harmonic motion is a periodic oscillation which in this case is the oscillation of a
weighted spring that is slightly stretched then released.
Hooke’s Law of elasticity simply states
that the extension produced by a spring is directly proportional to the load given to that spring; it
can be illustrated in the equation: F
spring
= 
k
Δ
x
, where F
spring
is the amount of force of the spring,
k
is Hooke’s constant, and Δ
x
is the change in length of the spring (
x
stretched
–
x
initial
).
The period of
oscillation of the spring can be illustrated in the equation:
T
= 2
π
[√ (
m
÷
k
)]
MATERIALS
U
2 springs
U
Yard stick
U
Weights
U
Stop watch
PROCEDURE
Part 1: Finding Hooke’s Constant
To determine Hooke’s constant,
k
, for the two springs a few grams of weight was added
to begin with and the length of the spring was measured.
This measurement was used as the
initial displacement,
x
0
, because this increases accuracy.
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 Fall '07
 Malik
 Physics, Mass, Simple Harmonic Motion, Robert Hooke

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