Higher Physics Lab Mechanics

Computerized Cavendish Balance SN1036


Exp-1 Determining of G, the fundamental gravitational Constant.
Exp-2 Determining the time of oscillation of a freely swinging torsion pendulum.
Exp-3 Determining the damping constant of oscillation of a freely swinging torsion pendulum.

Principle and Working:
In this set-up, the angular acceleration of a beam containing two small lead balls is measured by an interface system that contains an integrated capacitive sensor. This angular deflection results from the gravitational attraction of two large lead balls held on a swivel arm onto the small lead balls on the beam. The beam containing the two small lead balls is held suspended by a thin tungsten thread. So when the larger balls are brought near to the smaller balls, the tungsten thread oscillates about its equilibrium position due to the restoring moment of rotation generated in the thread. The measurements can be monitored on a computer.


S. No. Item Name Qty.
1 Cavendish Balance Apparatus 1
2 Interface Cable (USB) 1
3 Software 1

* Additionally Required
Computer not supplied with this setup.

Mechanics Experiments