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Date: | Mon, 5 Nov 2007 12:18:23 -0500 |
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ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
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Hi, all -
If your institution (or an institution you know or have visited) has
either of the following types of exhibits, would you please email me
off-list ([log in to unmask]) to let me know?
1) A "giant pulley" exhibit - the kind where visitors sit on a series of
chairs (usually 2 or 3), each of which has a pulley system of a
different mechanical advantage (i.e., different numbers of
pulleys/ropes), and try to pull themselves toward the ceiling using the
pulley systems.
2) A "giant lever" exhibit - a) The first-class lever kind, in which a
heavy load is placed on one end of the lever, and ropes of varying
distance from the fulcrum are placed on the other OR b) The
second(?)-class lever kind, in which the fulcrum is on the floor and 2
ropes are attached on a lever extending toward the ceiling at different
distances from the fulcrum. (When I've seen visitors use this exhibit,
it's often been as a "tug-of-war".)
Thanks,
Bill
Bill Watson
Research Assistant, SCALE-uP
Doctoral Candidate, Curriculum & Instruction
The George Washington University
(202) 994-1171
www.gwu.edu/~scale-up
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