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PHYWE Cavendish Gravitational Constant |
Learn about:
- Law of gravitation
- Torsional vibrations
- Free and damped oscillations
- Forced oscillations
- Angular restoring moment
- Moment of inertia of spheres and rods
- Steiner's theorem
- Shear modulus
Two small lead balls of equal mass are positioned one at each end of a beam which is held suspended by a thin tungsten thread, so that it can swing freely across its equilibrium position.
When two further, but larger, lead balls held on a swivel arm are now brought near to the small lead balls, forces of attraction resulting from gravitation effect acceleration of the small balls in the direction of the larger balls. At the same time, the twisted metal thread generates a restoring moment of rotation, so that the beam is subjected to damped oscillation across a new equilibrium position. The gravitational constant can be determined both from the difference in the angle of rotation of the different equilibrium positions and from the dynamic behavior of the swinging system during attraction.
An integrated capacitive sensor produces a direct voltage that is proportional to the angle of deflection. This can be recorded over time by an interface system, and the value of the angle of rotation that is required can be determined.
With this experiment, you can determine the time of oscillation and the damping of the freely swinging torsion pendulum and determine the gravitational constant. This can be done by a variety of methods using either the acceleration method, the final deflection method, or the resonance method.
Specifications:
Average mass of a large lead ball = 1.049 kg
Average mass of a small lead ball = 14.50 X 10-3 kg
Average radius of a small lead ball = 0.67 X 10-2 m
Average radius of a large ball = 2.82 X 10-2 m
Includes computerized cavendish-balance, data cable, circular level, and manual on CD-ROM.
System requirements:
PC, Windows 95 or higher
For your convenience this experiment is available to you as a complete set.
Everything you require to perform the activities are included in the total price.
For assistance in using your new equipment we also offer professional development (WLS1808-24) on all PHYWE line products.
For customization options and pricing please contact your local Cenco representative.
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