1 / 6

Relative Motion

Relative Motion. An important concept of formalize. Cusa (1440) argument.

troy-parks
Télécharger la présentation

Relative Motion

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Relative Motion An important concept of formalize

  2. Cusa (1440) argument • the earth and the sun are merely possible points of view from which the motions of the celestial bodies may be described. While the Ptolemaic system which represent the planetary motions by combinations of circular motions - could take any point to be fixed, the choice of any particular point required some justification on other than astronomical grounds - there has to be some sensible definition and agreement on what is chosen as fixed.

  3. Galileo’s Argument If the earth is rotating sufficiently uniformly, a stone dropped from the tower will fall straight to the base, just as a stone dropped from the mast of a uniformly moving ship will fall to the foot of the mast. In both cases the stone's vertical motion will be smoothly composed with its horizontal motion. Hence a sufficiently uniform motion will be indistinguishable from rest.

  4. Try this on an Airplane

  5. An example coordinate system Eratosthenes Map of the World - 220 BC

  6. A coordinate system • An agreed upon reference frame • The position and time (difficult) of a physical event can be placed in this coordinate system • All observers, independent of their particular location, can agree on the occurrence of that event • Without a coordinate system, there can be no UNIVERSAL event.

More Related