14-01-2014, 04:35 PM
TURN TABLE APPARATUS - RPM PICK UP
Aim:
To determine angular velocity , angular acceleration, mass moment of inertia and centrifugal
force of reciprocating masses
Apparatus required:
Turn table, masses, steel rule
Introduction:
In the case of linear motion, an unbalanced force F acting on an object gives it acceleration
‘a’, and by Newton’s second law,
F = ma
Where, ‘m’ is the mass of the object.
For rotational motion, unbalanced torque τ acting on a body causes it to rotate ( i.e., gives it angular
acceleration α ). The rotational analog of Newton’s second law is
τ = Iα
-------------- (Equation 1)
where ‘I’ is the moment of inertia of the body.
The moment of inertia of the body depends on its mass distribution and shape. For a symmetrical,
homogeneous object, the moment of inertia can derived theoretically using calculus methods, and
expressed in terms of the object`s total mass and dimensions. By determining these quantities, the
moment of inertia can be determined experimentally from the dynamical equation