Science Kit: K-12 Science Education Supplies, Equipment, Activities & Kits. U.C. Berkeley Physics Lecture Demonstrations. Index to Physics Demonstration Equipment. Index to Physics Notebooks Back to Physics Demonstrations' Home Page Acceleration.
Bearing Balls:Ceramic,Miniature Ball Bearings. 1 1/2" inch Diameter Chrome Steel Bearing Balls G24 Pack (4) Ball Bearings. Orbits in Strongly Curved Spacetime. Introduction The display above shows, from three different physical perspectives, the orbit of a low-mass test particle, the small red circle, around a non-rotating black hole (represented by a grey circle in the panel at the right, where the radius of the circle is the black hole's gravitational radius, or event horizon.
Kepler's laws of planetary motion, grounded in Newton's theory of gravity, state that the orbit of a test particle around a massive object is an ellipse with one focus at the centre of the massive object.