Lab 127 – Torque, Inertia and Rotational Kinetic Energy
11/10/06
Group 1:
Russell Adams
Pawel Bokota
Vahid Hamidullah
Mike Makhlouf
Physics 111A
TA: Ke Su (
[email protected]
)
1.  Objective
Part I
– To determine the rotational inertial of a rotating bodies
I
by measuring their
angular acceleration ά and compare this measurement with the rotational inertia computed from
physical measurements.
Part II
– Compute the energy loss of the system and compare the mechanical energy of
the system at two points in time.
2. – Theory
Torque:
τ = Fr
┴
Where
F
= force, r
┴ =
shortest distance between the line
of
F
and axis of rotation
O
. if the force F accelerates (or
tries to rotate) a body counterclockwise the torque is
positive, negative otherwise.
Rotational Inertia:
I = mr
2
In general: to find rotational inertia of a body you have
to “slice” the body into a narrow strips of width dr
(circular shape), calculate rotational inertia dI of one of
them at distance r from axis of rotation
O
, then integrate
dI all over the body.
If the shape of the body can be easily described by a function then calculations are pretty
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 Spring '10
 Universal
 Physics, Angular Momentum, Energy, Inertia, Kinetic Energy, Moment Of Inertia, rotational kinetic energy

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