Differences between revisions 16 and 32 (spanning 16 versions)

Gravity

PIRA classification 1L

20 Demonstrations listed of which 9 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 demonstrates the basic ideas behind this important experiment.
1L10.30	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. See AJP 55(4),380.
1L10.36	Modified Torsion Balance	A very small suspension wire is used allowing the linear accelerations to be measured directly. See AJP 57(5), 417.
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. See AJP 51(4), 367.

1L20. Orbits

PIRA #	Demonstration Name	Abstract
1L20.10	Rubber_Membrane	Deform a rubber membrane with a lead ball resting at it's center, representing a potential well. Marbles are then sent slightly off center which follow the warps in the membrane.
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. See Sutton M-131.
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	Gravity Coin Well	This demonstration consists of a 56 inch diameter hyperbolic funnel. Coins dropped into this funnel loosely approximate the behavior of matter spiraling into a gravity well. The orbits the coins make can be compared to planetary motion.
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. See TPT 16(5), 316.
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	Ellipse_Board	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)

Demonstrations

Home

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-||<:25%>[:PiraScheme#Mechanics: Table of Mechanics]||<:25%>[:AppNewtonsLaws: Mechanics (1K): Applications of Newton's Laws]||<:25%>[:WorkEnergy: Mechanics (1M): Work and Energy]||<:25%>[:Demonstrations:Lecture Demonstrations]||
+||<:25%>[[PiraScheme#Mechanics| Table of Mechanics]]||<:25%>[[AppNewtonsLaws| Mechanics (1K): Applications of Newton's Laws]]||<:25%>[[WorkEnergy| Mechanics (1M): Work and Energy]]||<:25%>[[Demonstrations|Lecture Demonstrations]]||
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-||1L10.20||Cavendish Balance Model||A model of the Cavendish balance.||
||1L10.30||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.||
||<#dddddd>1L10.36||<#dddddd>Modified Torsion Balance||<#dddddd>A very small suspension wire is used allowing the linear accelerations to be measured directly.||
||<#dddddd>1L10.42||<#dddddd>Servo Mechanism Cavendish Balance||<#dddddd>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.||
+||1L10.20||[[Cavendish_Balance_Model]]||A model of the Cavendish balance demonstrates the basic ideas behind this important experiment.||
||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.||
||<#dddddd>1L10.34||<#dddddd>Cavendish Balance Wire Replacement||<#dddddd>Use amorphous metallic ribbon as a wire replacement which gives a higher spring constant and is more durable. See [[http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=AJPIAS000055000004000380000001&idtype=cvips&doi=10.1119/1.15156&prog=normal|AJP 55(4),380]].||
||<#dddddd>1L10.36||<#dddddd>Modified Torsion Balance||<#dddddd>A very small suspension wire is used allowing the linear accelerations to be measured directly. See [[http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=AJPIAS000057000005000417000001&idtype=cvips&doi=10.1119/1.16013&prog=normal|AJP 57(5), 417]].||
||<#dddddd>1L10.42||<#dddddd>Servo Mechanism Cavendish Balance||<#dddddd>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. See [[http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=AJPIAS000051000004000367000001&idtype=cvips&doi=10.1119/1.13251&prog=normal|AJP 51(4), 367]].||
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-||1L20.10||Gravity Well - Rubber Membrane||A rubber membrane is used to represent potential wells.||
||<#dddddd>1L20.12||<#dddddd>Gravity Well on Overhead Projector||Making a Lucite 1/R surface for use on the overhead projector.||
||<#dddddd>1L20.14||<#dddddd>Elliptical Motion||A ball rolling in a funnel or cone.||
+||1L20.10||[[Rubber_Membrane]]||Deform a rubber membrane with a lead ball resting at it's center, representing a potential well. Marbles are then sent slightly off center which follow the warps in the membrane.||
||<#dddddd>1L20.12||<#dddddd>Gravity Well on Overhead Projector||<#dddddd>Making a Lucite 1/R surface for use on the overhead projector.||
||<#dddddd>1L20.14||<#dddddd>Elliptical Motion||<#dddddd>A ball rolling in a funnel or cone. See [[http://physicslearning.colorado.edu/PIRA/Sutton/PARTI.pdf#pagemode=none&page=1|Sutton M-131]].||
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-||<#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.||
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+||1L20.20||[[GravityWell| Gravity Coin Well]] ||This demonstration consists of a 56 inch diameter hyperbolic funnel. Coins dropped into this funnel loosely approximate the behavior of matter spiraling into a gravity well. The orbits the coins make can be compared to planetary motion.  ||
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-||<#dddddd>1L20.35||<#dddddd>spin-orbit coupling||<#dddddd>A spinning ball orbits in a watch glass with increasing radii until it escapes.||
||1L20.36||	"Motion of Attracting Bodies" film||	Meeks film, 6:30 min. Computer animated. Covers Newton's laws, earth's gravity variations, satellite and binary orbits.||
||1L20.40||	conic sections||	A dissectible cone is cut several ways to give a circle, ellipse, parabola, and hyperbola.||
||1L20.40||	sections of a cone||	The standard wood cone.||
||1L20.45||	drawing ellipses||	The two nail and string method for ellipse drawing.||
||1L20.50||	ellipse drawer||	An aluminum bar with adjustable pegs and a loop of string for drawing the ellipse.||
||1L20.51||	ellipse drawing board||	The two nail and string method of drawing on paper.||
||1L20.55||	orbit drawing machine||	Design for orbit drawing machines for use on the overhead projector. A simple one draws elliptical orbits only, an elaborate one draws general Coulomb orbits.||
||1L20.61||	dry ice puck orbits||	A dry ice puck on a large table is tethered through a hole in the center to a vacuum ping pong ball device under the table that gives an inverse square law force. Construction details p.573.||
||1L20.62||	dry ice puck Kepler's law||	A dry ice puck has a magnet mounted vertically with a second one below the table which may be inverted to show both attraction and repulsion.||
||1L20.62||	dry ice puck Kepler's law||	A strong magnet is placed under the air table and a magnetic puck with a light is photographed.||
||1L20.62||	air table Kepler's laws||	With a strong magnet below the table, take strobe photos of a magnetic puck to demonstrate equal areas. TPT 8(4),244.||
||1L20.63||	dry ice puck Kepler's law||	Motor at the center of the table with a special pulley arrangement.||
||1L20.64||	areal velocity conservation||	Analyze a strobe photograph of one cylindrical magnet on dry ice approaching another and deflecting.||
||1L20.65||	fancy air puck Kepler's law||	The puck has a variable thruster and is of variable mass. A Peaucellier linkage is used to apply central force.||
||1L20.66||	"gravity" with magnetic field||	Drop a ball near a magnetron magnet and watch it curve around about 150 degrees.||
||1L20.69||	inverse square law motion||	Pointer to A-62, A-63. Very crude models of planetary motion.||
||1L20.71||	"Planetary Motion and Kepler's Laws"||	Meeks film, 8:45 min. Computer Animated. Shows orbits of the planets, covers Kepler's second and third laws.||
+||<#dddddd>1L20.35||<#dddddd>Spin-Orbit Coupling||<#dddddd>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. See [[http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=PHTEAH000016000005000316000001&idtype=cvips&doi=10.1119/1.2339956&prog=normal|TPT 16(5), 316]].||
||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||[[Ellipse_Board]]||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.||
||<#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) ||
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- * 1L20.10 [:GravityWell: Gravity Coin Well]
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fw: Diff for "Gravity"

Gravity

1L10. Universal Gravitational Constant

1L20. Orbits