Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538
Demonstrations are cataloged according to PIRA Bibliography
PLEASE REQUEST DEMOS WELL IN ADVANCE
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.
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Purpose:To give insight into Newton's Law of Inertia.
Procedure:The water hammer is a vacuum bulb partially filled with water. When given a quick, downward thrust it produces a rather loud 'crack', much like the sound heard in old water pipes. Caution needs to be taken not to hit the water hammer against anything.
An alternative version is to have a capped bottle of a drink and tap it with a mallet. The impact is so strong it will blow the bottle's bottom off (see video for the slow motion version)