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 A+0+0 "Coin and Feather" fall in an evacuated rotatable tube. A+0+5 Timed free fall: Ball drops 2 meters through electronic timing gate. A+0+10 Atwood machine: Unbalanced weights on a pulley accelerate slowly.
A+0+15 A falling weight accelerates a car horizontally. A+0+20 Acceleration of a steel ball down an inclined plane with metronome. A+0+22 Inclined airtrack with gliders and timing gates. A+0+23 Inclined airtrack: Cart and ball accelerate in unison. A+0+25 Cork float accelerometer: Cork and water in sealed flask. A+0+30 A chain dropped onto a force plate. A+0+35 A ball swung on a string held by a sleeve. A+0+40 Conical pendulum: Similar to A+0+35 with standard weights. A+0+45 Loop the loop: Sphere, hoop, disk rolled down a looped track. A+0+47 Swing water in a bucket. A+0+50 Candles rotating about an axis. A+0+55 Mercury and colored water in a rotating glass vessel. A+0+57 Rotating loop of chain rolls across bench. 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. But when gravitational fields are strong, as is the case for collapsed objects like neutron stars and black holes, Newton's theory is inaccurate; calculations must be done using Einstein's theory of General Relativity. In Newtonian gravitation, an orbit is always an ellipse.
The Orbit Plot The panel at the right of the applet shows the test mass orbiting the black hole, viewed perpendicular to the plane of its orbit. The Gravitational Effective-Potential The Gravity Well.