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:
Measurement
Measurements and Standards
video  - Standards of Measurement
Probability Board
Coordinate Systems and Vectors
Scaling
video  - Grains of Rice
Motion In One Dimension
Motion In Two Dimensions
Newton's First Law
Newton's Second Law
Newton's Third Law
Statics Of Rigid Bodies
Applications Of Newton's Laws
Gravity
Work and Energy
Momentum
Rotational Motion
Properties of Matter

### video  - Standards of Measurement

#### Purpose:

To dramatize the need for fixed standards of measurement.

#### Procedure:

DEMO VIDEO DOWNLOAD - HD - 1920x1080 / 27.4Mbps - 272MB size

DEMO VIDEO DOWNLOAD - LD - 854x480 / 5.69Mbps - 64MB size

Before class, set tower to a collapsed height of 94cm.

Give meter sticks to two students and have student with the "short" 98cm meter stick measure the tower first. Record results.

Expand tower 1cm, and have second student with the regular meter stick re-measure the expanded tower.

The fully compressed tower is 94cm. When measured by a short meter stick it'll measure 96cm. When expanded by 1cm, on either scale, it'll re-measure as 95cm on a regular meter stick. So the drama is that instead of gaining a centimeter over the original length we loose a centimeter.

#### Equipment:

• Meter Stick
• 1 Expandable tower
• 98 cm meter stick