TC Neuhs
11/19/07
Physics 11
E. Sabancilar
Lab #5: Rotational Inertia
Introduction and Theory:
The purpose of this lab was to investigate the forces around a fixed rotational axis.
We did so by
first looking at the components of the wheel and then applying different forces.
We can then
find the angular acceleration because of Newton’s second law we know that
τ =Iα
where τ is torque, I is the moment of inertia and α is the angular acceleration.
We can then say
that the angular acceleration is
α =
τI
in this case a constant torque would produce a constant angular acceleration and therefore allow
us to us the kinematic expressions.
By using these kinematics we can then say the rotation about
a fixed object can be represented by
ω = ω
o
+ α t
or
θ = θ
o
+ ω
o
t +
12 αt2
where t is the time recorded, θ is the angular displacement and ω is the angular velocity.
By
applying a torque through a hanging mass we can determine the dependence of angular
acceleration on the applied torque.
Data and Performance
See attached data sheet for raw data.
In this lab we were able to calculate the moment of inertia of the wheel assembly by breaking it
down into different, less complex pieces.
After finding these different pieces we determined
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 Spring '08
 Gallager
 Physics, Angular Momentum, Force, Inertia, Moment Of Inertia, Rotation, Angular Acceleration, Physical quantities

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