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1R50.20dCrystal Lattice ModelsShow model of Copper <#dddddd>1R50.20e<#dddddd>Crystal Lattice Models<#dddddd>Show model of Diamond {MISSING} 1R50.20fCrystal Lattice ModelsShow model of Fluorite  1R50.20gCrystal Lattice ModelsShow model of Germanium 1R50.20hCrystal Lattice ModelsShow model of "N" Germanium 1R50.20iCrystal Lattice ModelsShow model of "P" Germanium 1R50.20jCrystal Lattice ModelsShow model of Graphite I 1R50.20kCrystal Lattice ModelsShow model of Graphite II <#dddddd>1R50.20l<#dddddd>Crystal Lattice Models<#dddddd>Show model of Magnesium <#dddddd>1R50.20m<#dddddd>Crystal Lattice Models<#dddddd>Show model of Silicone 1R50.20nCrystal Lattice ModelsShow model of Sodium Chloride 1R50.20oCrystal Lattice ModelsShow model of YiBCO 
1R50.20dCrystal Lattice ModelsShow model of Cesium Chloride 1R50.20eCrystal Lattice ModelsShow model of Copper <#dddddd>1R50.20f<#dddddd>Crystal Lattice Models<#dddddd>Show model of Diamond {MISSING} 1R50.20gCrystal Lattice ModelsShow model of Fluorite  1R50.20hCrystal Lattice ModelsShow model of Germanium 1R50.20iCrystal Lattice ModelsShow model of "N" Germanium 1R50.20jCrystal Lattice ModelsShow model of "P" Germanium 1R50.20kCrystal Lattice ModelsShow model of Graphite I 1R50.20lCrystal Lattice ModelsShow model of Graphite II 1R50.20mCrystal Lattice ModelsShow model of Magnesium 1R50.20nCrystal Lattice ModelsShow model of Silicone 1R50.20oCrystal Lattice ModelsShow model of Sodium Chloride 1R50.20pCrystal Lattice ModelsShow model of YiBCO 
Properties of Matter
PIRA classification 1R
62 Demonstrations listed of which 26 are grayed out
Grayed out demonstrations are not available or within our archive and are under consideration to be added. 
1R10. Hooke's Law
PIRA # 
Demonstration Name 
Abstract 
1R10.10 
Hooke's_law (The Big Spring) 
Add weights to a large vertical spring one kg at a time. Examining the forcedisplacement which is marked in Newtons. 
1R10.25 
Pull on a Horizontal Spring 
Pull on a horizontal spring with a spring scale. 
1R10.30 
Springs in Series and Parallel 
Pull on a spring, springs in series, and springs in parallel with a spring scale. Compare the force required to stretch each case. 
1R20. Tensile and Compressive Stress
PIRA # 
Demonstration Name 
Abstract 
1R20.10 
Breaking Wire 
Add weights to wire that is attached to the ceiling until the wire breaks. Insert a large spring scale if one wishes. 
1R20.11 
Elastic Limits 
Stretch springs of copper and brass. The copper spring remains extended. 
1R20.15 
Young's Modulus 
Hang weights from a wire that runs the length of the benches. Add 1/2 kg masses to the copper wire and show that the Stretched deflection goes back when the mass is removed. Use either laser and mirror optical lever to display the deflection or a arrow on the pulley. Add a lot of mass to show the Elastic Limit. 
1R20.18 
Poisson's Ratio 
A rubber hose is stretched to show lateral contraction with increasing length. 
1R20.20 
Bending or Sagging Board 
Ten lbs. is hung from the center of a meter stick supported at the ends. Orient the meter stick on edge and then on the flat. Place the ends of a thin board on blocks, then add mass to the center. 
1R20.20 
Beams Under Stress 
A rectangular cross section bar is loaded in the middle while resting on narrow and broad faces. Hang weights at the ends of extended beams. Use beams of different lengths and cross sections. Hang weights at the ends of extended beams. Use beams of different lengths and cross sections. 
1R20.27 
Aluminum/Steel Elasticity Paradox 
Copper and brass rods sag different amounts under their own weight but steel and aluminum do not. 
1R20.31 
Stretch a Hole 
Holes arranged circle in a rubber sheet deform into an ellipse when stretched. 
1R20.32 
Deformation Under Stress 
A pattern is painted on a sheet of rubber and deformed by pulling on opposite sides. 
1R20.38 
Stress on a Brass Ring 
A strain gauge bridge is used to measure the forces required to deform a brass ring. Diagram. Construction details. 
1R20.60 
Bologna Bottle 
Pound a nail with a Bologna bottle, then add a carborundum crystal to shatter the bottle. 
1R20.70 
Prince Rupert's Drops 
Drops of glass cooled quickly can be hit with a hammer but shatter when the tip is broken off. 
1R30. Transfer of Angular Momentum
PIRA # 
Demonstration Name 
Abstract 
1R30.10 
Shear Pages of a Book 
Use a very thick book to demonstrate shear. 
1R30.11 
Use a tall stack of cards placed sequentially offcenter to create a ledge. 

1R30.20 
Materiel Shearing 
Push on the top of a large foam block or use a large sponge or use a rectangular block of rubber to show shear of different materials. 
1R30.30 
Spring Cube 
A 3x3x3 cube of 27 cork balls is held together with springs. 
1R30.31 
Plywood Sheets 
A stack of plywood sheets with springs at the corners is used to show shear, torsion, bending, etc. 
1R30.35 
Shear and Stress Modulus 
Unsophisticated apparatus for measuring elastic constants of a thin flexible strip and rod. 
1R30.40 
Torsion Rod 
Rods of various materials and diameters are twisted in a torsion lathe. 
1R30.41 
Bending and Twisting 
Wind a copper strip around a rod and then remove the rod and pull the strip straight to show twisting. 
1R30.45 
Shear and Twist in Screw Dislocation 
Rule a thick walled vacuum tube with a grid, slit lengthwise, and dislocate one unit. 
1R30.xx 
Train on a Bicycle Wheel 
An "O" Scale train is placed on a horizontal bicycle wheel that is free to rotate. When the train is running, one can let the train go around the track or have it stand still will the track is rotating underneath. 
1R30.xx 
Wheel and Axle I 
A large midevil looking wheel on an axle. A large lead ball on a rope is wound up on the axle and the wheel free to rotate. 
1R40. Coefficient of Restitution
PIRA # 
Demonstration Name 
Abstract 
1R40.10 
Drop balls of different material on to a tool steel plate. Loss of mechanical energy in the coefficient of restitution. Drop balls on a glass plate. Balls of various materials are bounced off plates of various materials. 

1R40.12 
Coefficient of Restitution 
Rubber balls of differing elasticity and silly putty are dropped in a clear tube near a meter stick onto a steel surface. 
1R40.13 
Coefficient of Restitution in Baseballs 
Analysis leading to a prediction of up to 15 foot difference in long fly balls due to variation in coefficient of restitution. 
1R40.30 
A bouncy ball and a nonbouncy ball are dropped from the same height with very different outcomes demonstrating the difference between elastic and inelastic collisions. 
1R50. Crystal Structure
PIRA # 
Demonstration Name 
Abstract 
1R50.10 
Solid Shapes 
How to make solid tetrahedrons and octahedrons. How to make Solids 
1R50.15 
Solid Models 
Styrofoam balls and steel ball bearings are used to make crystal models. 
1R50.16a 
Lattice Models 
Show model of Body Centered Cubic (BCC) 
1R50.16b 
Lattice Models 
Show model of Face Centered Cubic (FCC) 
1R50.16c 
Lattice Models 
Show model of Hexagonal Close Packed (HCP) 
1R50.16d 
Lattice Models 
Show model of Miller Indices 
1R50.16e 
Lattice Models 
Show model of Sphalerite Model 
1R50.16f 
Lattice Models 
Show model of Wurtzite Model 
1R50.18 
Elastic Crystal Models 
Crystal models are built with a combination of compression and tension springs. 
1R50.20a 
Crystal Lattice Models 
Show model of Calcite 
1R50.20b 
Crystal Lattice Models 
Show model of Calcite 2 
1R50.20c 
Crystal Lattice Models 
Show model of Carbon Dioxide 
1R50.20d 
Crystal Lattice Models 
Show model of Cesium Chloride 
1R50.20e 
Crystal Lattice Models 
Show model of Copper 
1R50.20f 
Crystal Lattice Models 
Show model of Diamond {MISSING} 
1R50.20g 
Crystal Lattice Models 
Show model of Fluorite 
1R50.20h 
Crystal Lattice Models 
Show model of Germanium 
1R50.20i 
Crystal Lattice Models 
Show model of "N" Germanium 
1R50.20j 
Crystal Lattice Models 
Show model of "P" Germanium 
1R50.20k 
Crystal Lattice Models 
Show model of Graphite I 
1R50.20l 
Crystal Lattice Models 
Show model of Graphite II 
1R50.20m 
Crystal Lattice Models 
Show model of Magnesium 
1R50.20n 
Crystal Lattice Models 
Show model of Silicone 
1R50.20o 
Crystal Lattice Models 
Show model of Sodium Chloride 
1R50.20p 
Crystal Lattice Models 
Show model of YiBCO 
1R50.22 
Tennis Ball Crystals 
Old tennis balls stacked together to give two close packed crystals. 
1R50.30 
Crystal Structure 
Show natural crystals of salt, quartz, and other minerals, and lantern slides of snow crystals. 
1R50.31 
Crystal Growth in a Film 
Crystal growth on a freezing soap film is observed through crossed Polaroids 
1R50.31 
Ice Nuclei 
Large ice crystals form on the surface of a supercooled saturated sugar solution. 
1R50.32 
Make Tin Crystal 
Pour pure tin into a Pyrex mold, other steps. 
1R50.40 
Stacking Fault Model 
A closest packing spheres model that demonstrates a fault going from fcc to hcp. 
1R50.40 
Crystal Faults 
One layer of small ball bearings between two Lucite sides. 
1R50.45 
Crushing Salt 
A large salt crystal is crushed in a "c" clamp. 