Loading in 5 sec....

The Newtonian equivalence principlePowerPoint Presentation

The Newtonian equivalence principle

- By
**hugh** - Follow User

- 80 Views
- Uploaded on

Download Presentation
## PowerPoint Slideshow about ' The Newtonian equivalence principle' - hugh

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

### The Newtonian equivalence principle

It states that gravity is indistinguishable from any other form of acceleration.

Roland Eötvös1848-1919

- Hungarian physicist.
- He studied the Earth’s gravitational field.
- He invented the torsion balance and showed that, to a high degree of accuracy, gravitational mass and inertial mass are equivalent.
- His work became a major principle of Albert Einstein’s general theory of relativity.

The torsion balance

- The torsion balance consists of two balls attached onto an insulating rod suspended from the middle by a thin wire. Eotvos used two spheres of identical mass but of different substances; one of wood one of platinum.
- For Eotvos, any deviation from the proportionality of gravitating and inertial masses could be checked by detecting differences in the direction of the acceleration of different substances, and that those differences might be detected by rotations of a horizontal rod.

Therefore, if the magnitude of the Coriolis force (centrifugal force due to the Earth rotation) and gravity had been different for the two bodies due to their different compositions, Eotvos would have detected a twisting of the wire. None was seen.

His experiment, performed in 1889, proved that the gravitational mass is proportional to the inertial mass up to 8 decimal figures ( not just 4 decimals as was known before): accuracy of 1/200 000 000.

The torsion balance (centrifugal force due to the Earth rotation) and gravity had been different for the two bodies due to their different compositions, Eotvos would have detected a twisting of the wire. None was seen.

Measurements (centrifugal force due to the Earth rotation) and gravity had been different for the two bodies due to their different compositions, Eotvos would have detected a twisting of the wire. None was seen.

Robert Dicke (centrifugal force due to the Earth rotation) and gravity had been different for the two bodies due to their different compositions, Eotvos would have detected a twisting of the wire. None was seen.1916-1997

- American experimental physicist.
- Dicke carried out a new experiment, using modern technology, and achieved an accuracy of 1/100 000 00 000.
- He was able to increase the sensitivity, compared to Eötvös, in part by measuring the accelerations of their test masses to the Sun, rather than to the Earth. Any signal arising from the difference between gravitational an inertial mass would have the same 24hour periodicity as the the Earth’s rotation.
- It allows the signal to be discriminated from background perturbations, without disturbing the torsion fibre.

- Works used (centrifugal force due to the Earth rotation) and gravity had been different for the two bodies due to their different compositions, Eotvos would have detected a twisting of the wire. None was seen.
- www.kfki.hu/eotvos/onehund.html
- www.norskfysikk.no/nfn/epsbiografer/EOTVOS.PDF
- www.kfki.hu/eotvos/stepcikk.html

Download Presentation

Connecting to Server..