fw: PropertiesOfMatter

PIRA #

Demonstration Name

Abstract

1R10.10

Stretching a Spring

Add masses to a pan balance and measure the deflection with a cathetometer. Examining the force-displacement curve at small extensions.

1R10.10

Hooke's law (The Big Spring)

Add 1, 2, or 5 Kg weights to a large spring, Examining the force-displacement markt 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 60 cm.

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.

1R20.12

Breaking Wire Support

Drill a hole axially up a 1/4" eye hook and solder the wire in.

1R20.15

Young's Modulus

Hang weights from a wire that runs the lenth 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.xx

Strain Gauge

An Aluminum driven Pendulum is connected to a Strain Gauge to measure the strain of the pendulum when it is driven hard.

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.

1R20.39

Squeeze the Bottle,Cartesian Diver

A filled whiskey flask with a stopper and a small test tube in side and upside down with air trapped within. Squeeze the bottle and watch the Diver, dive and rise.

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.

PIRA #

Demonstration Name

Abstract

PIRA #

Demonstration Name

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PIRA #

Demonstration Name

Abstract

1R40.10

[:MEEquipmentList:Bouncing Ball]

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.

1R40.10

Coefficient of Restitution

Drop glass, steel, rubber, brass, and lead balls onto a steel plate.

1R40.11

Coefficient of Restitution

Drop a small ball bearing on a concave lens.

1R40.12

Coefficient of Restitution

Rubber balls of differing elasticity and silly putty are dropped in a tube onto a steel surface.

1R40.13

Coeffficient 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

[:HappySad:Happy and Sad Balls]

One bounce and the other doesn't.

PIRA #

Demonstration Name

Abstract