[:PiraScheme#Mechanics: Table of Mechanics]

[:RelativeMotion: Mechanics (1E): Relative Motion]

[:Newtons2NDLaw: Mechanics (1G): Newton's Second Law]

[:Demonstrations:Lecture Demonstrations]

Grayed Demos are either not available or haven't been built yet.

PIRA #

Demonstration Name

Abstract

1F10.10

Inertia Balance

A torsion pendulum has cups that can be loaded with various masses.

1F10.11

Inertia Balance

Place masses on a platform supported by horizontal leaf springs.

1F10.12

Inertia Oscillation

A puck between two springs rolling on Dy-lite beads is timed with several different masses.

1F10.13

Inertia Balance

Measure the period of a commercially available (?) inertia balance by using a stroboscope.

1F10.20

Inertia Bongs

Hit hanging 2"x4"x10" blocks of wood and steel with a hammer.

1F10.20

Inertia Bongs

Two large cylinders are suspended, one wood (3Kg) and one iron (50Kg). Students compare displacements when struck by a hammer or just push the things around.

1F10.25

Foam Rocks

Hit a real rock (granite) then a foam rock (looks like granite) with a hammer. Throw a form rock at some students.

1F10.30

Judging Inertial Mass

A blindfolded volunteer compares a mass on a string with a mass on a roller cart.

PIRA #

Demonstration Name

Abstract

1F20.10

Inertia Balls

A heavy ball is suspended by a string with identical strings tied from the bottom. Give a quick jerk to one and pull the other slowly.

1F20.13

Inertia Stick

A long stick is supported from rings of filter paper at each end. Break the filter paper with a pull or the stick with a jerk.

1F20.15

Inertia Block

A 50 lb mass is mounted on rollers. A thread will pull it but a rope can be broken with a jerk.

1F20.16

Inertia Block

Tie a loop of 7/16" braided cotton cord through a hole in a 2"x4"x10" steel block. Pull and jerk with a hammer.

1F20.20

Smash Your Hand

Place a lead block on your hand and hit it with a hammer.

1F20.22

Hit the Nail on the Head

Drive a nail into a large block of wood placed on a student's head.

1F20.25

Bed of Nails

A bed of nails is placed on the chest before smashing the block with a sledge.

1F20.26

Vibrograph

An optical lever arrangement for magnifying small displacements of a large mass when the table is hit with a hammer.

1F20.30

Tablecloth Pull

Pull the tablecloth out from under a place setting.

1F20.33

Inertia Cylinder

Stand a 3/4" x 6" aluminum cylinder on a sheet of paper. Jerk the paper out from under the cylinder.

1F20.34

card/coin snap

Snap a card out from under a tall object, e.g., a shipping tag from under a balanced claw hammer.

1F20.35

eggs and pizza pan

Place a pizza pan on three beakers, place cardboard tubes on the pan directly above the beakers, and eggs on the tubes. Knock out the pizza pan.

1F20.40

stick on wine glasses

Stick needles in the ends of a 3/4" sq x 4' clear pine bar. Place the needles on wine glasses full of water and break the stick with an iron bar.

1F20.50

shifted air track inertia

Support an air track on wheels. Move the air track under an air glider.

1F20.61

inertia cart

A cart has a pivoting arm with different masses but the same volume at the ends. The greater mass lags behind as the cart is accelerated.

1F20.62

string of weights

A string of weights connected by springs shows uneven deformation when jerked.

PIRA #

Demonstration Name

Abstract

1F30.10

persistence of motion (air track)

A single cart on the air track.

1F30.11

air table puck

Air table with a puck.

1F30.13

CO2 block

A large piece of dry ice on a flat formica top wetted with alcohol.

1F30.21

water hammer

Some water in an evacuated test tube clicks when the water hits the end of the tube.

1F30.21

water hammer

Shut off the sink faucet and a water hammer may be heard. A small tube evacuated with some water shows the effect nicely.

1F30.21

water hammer

A tube is evacuated except for some water. When the tube is stopped suddenly, the water strikes the end of the tube with a click.

1F30.21

water hammer

Evacuate a glass tube containing water.

1F30.30

car on cart on cart

A small car on a skateboard on a large roller cart hits a stop level with the roller cart and the skateboard and car continue to move at constant velocity.

1F30.30

cart on a cart

A smaller roller cart is placed on a larger one. when the larger is stopped, the smaller continues.

1F30.40

nail by hand

Follow the directions in TPT 18(1),50.

1F30.40

hand pile driver

Drive a nail into wood with your bare hands.

1F30.50

pencil and plywood

Place a pencil in a brass tube hooked to a fire extinguisher. Fire the pencil into a 1/2" plywood board.

1F30.50

pencil and plywood

Use a CO2 extinguisher to fire a pencil through a 1/2" plywood.