Differences between revisions 20 and 21
 ⇤ ← Revision 20 as of 2011-06-28 18:50:16 → Size: 3787 Editor: srnarf Comment: ← Revision 21 as of 2011-06-28 19:26:58 → ⇥ Size: 3823 Editor: srnarf Comment: Deletions are marked like this. Additions are marked like this. Line 30: Line 30: ||<#dddddd>1L20.17||<#dddddd>Orbits in a Wineglass||<#dddddd>A properly shaped wine glass is used with ball bearings to show radius to orbit period, orbit decay, etc.|| ||1L20.17||Orbits in a Wineglass||A properly shaped wine glass is used with ball bearings to show radius to orbit period, orbit decay, etc.|| Line 32: Line 32: ||1L20.20||[:GravityWell: Gravity Coin Well] || || Line 36: Line 37: ||1L20.45||Drawing Ellipses||The two nail and string method for ellipse drawing.|| ||1L20.45||Drawing Ellipses||The two pegs and string method for ellipse drawing on a whiteboard.|| Line 38: Line 39: ||1L20.71||"Planetary Motion and Kepler's Laws"||A 9min computer animated film shows orbits of the planets, covers Kepler's second and third laws.|| ||<#dddddd>1L20.71||<#dddddd>"Planetary Motion and Kepler's Laws"||<#dddddd>A 9min computer animated film shows orbits of the planets, covers Kepler's second and third laws. (Lost Item) || Line 40: Line 41: * 1L20.10 [:GravityWell: Gravity Coin Well]
 [:PiraScheme#Mechanics: Table of Mechanics] [:AppNewtonsLaws: Mechanics (1K): Applications of Newton's Laws] [:WorkEnergy: Mechanics (1M): Work and Energy] [:Demonstrations:Lecture Demonstrations]

## Gravity

PIRA classification 1L

?? Demonstrations listed of which ?? are grayed out

 Grayed out demonstrations are not available or within our archive and are under consideration to be added.

# 1L10. Universal Gravitational Constant

 PIRA # Demonstration Name Abstract 1L10.10 Cavendish Balance Film Loop Time lapse of the Cavendish experiment. 1L10.20 Cavendish Balance Model A model of the Cavendish balance. 1L10.30 [:CavendishBalance:Cavendish Balance] Standard Cavendish experiment with lead balls and optical lever detection, mounted permanently in the classrooms. Adjust hours before the experiment. 1L10.34 Cavendish Balance Wire Replacement Use amorphous metallic ribbon as a wire replacement which gives a higher spring constant and is more durable. 1L10.36 Modified Torsion Balance A very small suspension wire is used allowing the linear accelerations to be measured directly. 1L10.42 Servo Mechanism Cavendish Balance The torsion bar does not appreciably rotate. A simple electronic servomechanism is used to maintain rotational equilibrium as an external mass is introduced. The resulting servo correction voltage is proportional to the torque due to gravity. This effect can be observed in tens of seconds.

# 1L20. Orbits

 PIRA # Demonstration Name Abstract 1L20.10 Gravity Well - Rubber Membrane A rubber membrane is used to represent potential wells. 1L20.12 Gravity Well on Overhead Projector Making a Lucite 1/R surface for use on the overhead projector. 1L20.14 Elliptical Motion A ball rolling in a funnel or cone. 1L20.16 Gravity Surface Using the Playskool drum as a gravity surface. 1L20.17 Orbits in a Wineglass A properly shaped wine glass is used with ball bearings to show radius to orbit period, orbit decay, etc. 1L20.18 Orbits in a Spherical Cavity Derivation of the period of a ball orbiting in a spherical cavity. Strobe lights help this demo. 1L20.20 [:GravityWell: Gravity Coin Well] 1L20.30 Rotating Gravitational Well A ball placed in a rotating potential well demonstrates the path of a satellite. Use a variable speed motor to show escape velocity. 1L20.35 Spin-Orbit Coupling Start a ball spinning like a top in a watch glass. It will convert the energy of its spin into an orbit. As time passes it converts more spin energy into larger orbits. 1L20.36 "Motion of Attracting Bodies" film A 7min computer animated film that covers Newton's laws, earth's gravity variations, satellite and binary orbits. 1L20.40 Conic Sections A dissectible cone, cut several ways can produce a circle, ellipse, parabola, and hyperbola. 1L20.45 Drawing Ellipses The two pegs and string method for ellipse drawing on a whiteboard. 1L20.66 Gravity Represented by a Magnetic Field Drop a ball near a magnetron magnet and watch it complete less than one orbit. 1L20.71 "Planetary Motion and Kepler's Laws" A 9min computer animated film shows orbits of the planets, covers Kepler's second and third laws. (Lost Item)

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fw: Gravity (last edited 2018-07-18 17:01:30 by srnarf)