Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538

# Physics Demo Manual

Demonstrations are cataloged according to PIRA Bibliography

Due to Physics Building renovations, the lead time to set up demo requests has increased due to the need to transport equipment across campus. Please be kind and let me know well ahead of time what you need.

 Choose a Topic or Enter a keyword to search: I cannot find what I want! You have selected the following Demos: None Selected

Choose a subtopic:
Surface Tension
Fluid Statics
Hydrostatic Pressure dependence on depth
video  - Pascal's Vases
Hydraulic Press
video  - Balloon in Vacuum
Marshmallow Man
video  - Crush the Soda Can
Magdeburg Hemispheres
Pressure Gauges
Qualitative Pressure Gauge
video  - Archimedes' Principle I
Archimedes' Principle II
Archimedes Principle III
Cartesian Diver
Buoyancy of Air
video  - Weight of Air
Fluid Dynamics

### video  - Archimedes' Principle I

#### Purpose:

To show that the buoyant force exerted on an object is equal to the weight of the displaced water (or fluid).

#### Procedure:

DEMO VIDEO DOWNLOAD w/ sound / 1920x1080 / 24.19Mb/s / 251MB size

DEMO VIDEO DOWNLOAD w/ sound / 854x480 / 5.69Mb/s / 60MB size

Get the students to believe that the inside of the silver cylinder has the same volume as the blue cylinder (put the blue cylinder into the silver cylinder). Hang the cylinders from the scale as shown and record their weight. Lower the blue cylinder into the water and show the change in weight. With the blue cylinder still submerged, fill the silver cylinder with water. Since the silver cylinder holds water equal in volume to the blue cylinder, the reading on the scale should return to the original reading before lowering the blue cylinder into the water.

#### Equipment:

• 4000 ml. Beaker
• 600 ml. Beaker
• Clamp
• 2 Lab Jack
• Metal Cylinder and Holding Can
• Newton Scale
• Stand
• Water