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Code Number: 8B40.20
Demo Title: Black Hole Surface - Fiberglass or Plastic
Condition: Good
Principle: Black Holes, Gravity Well
Area of Study: Stellar Astronomy
Equipment: Fiberglass and Plastic "Wishing Well" Cones.
Procedure:
Use 1 inch ball bearings for the large Fiberglass cones. Cones of 24 inch diameter and 40 inch diameter are available. There will appear to be an event horizon just before the ball drops out of the cone and into the holder.
Use 1/4 inch ball bearings for the smaller (10 inch diameter) plastic cone.
References:
- Harry Manos, "Making Inexpensive 3-D Models", TPT, Vol. 54, #3, Mar. 2016, p. 150.
- R. D. Edge, "String and Sticky Tape Experiments: The Funny Physics Funnel", TPT, Vol. 28, #8, Nov. 1990, p. 575.
- Katashi Nose, "Constructing a Potential Well-Hill for Overhead Projectors", TPT, Vol. 16, #7, Oct. 1978, p. 504.
- L. Q. English and A. Mareno, "Trajectories of Rolling Marbles on Various Funnels", AJP, Vol. 80, #11, Nov. 2012, p. 996.
- M. Kaan Öztürk, "Trajectories of Charged Participles Trapped in Earth's Magnetic Field", AJP, Vol. 80, #5, May 2012, p. 420.
- "M-822. Garbage Bag - VORTX - Ball & String", DICK and RAE Physics Demo Notebook.
- David Kutliroff, "49. An Inverse Square Law Force Field Sculpture", 101 Classroom Demonstrations and Experimenters for Teaching Physics, p. 109 - 111.
- Robert Ehrlich, "B.3. Acceleration as an Effect of Curved Space-Time", Turning the World Inside Out, p. 17 - 20.
- Robert Ehrlich, "B.2. Simulation of the Gravitational Deflection of Light", Turning the World Inside Out, p. 14 - 17.