Date: Wed, 9 Feb 2011 15:20:23 -

Author: --- Steve Anderson

Subject: Re: inexpensive masses?

Post:


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Karen,

at some machine shops with punch-presses, they have washer-shaped =
punch-outs.
(from where they punch holes in the steel plates) these are often waste =
or free.

Your Facilities Services / Plumbers might have a big bin of big washers, =
they might share.
~~~~Industrial waste can be a good thing, people do help when I ask.

once got a bunch of those little plastic eggs (or pumpkins) after a =
holiday,=20
and filled them with sand, and glued shut.
You poke a little hole on the top, feed through the string, and tie a =
knot,
for a pendulum bob.

S. Anderson
CSU Sonoma

> I am putting together some experiments on the topics of forces and =
simple machines to do with the 3rd graders at our local elementary =
school, and I'm in need of suggestions for inexpensive objects to use =
for masses / weights.=20
>=20
> I bought a box of washers, which were about 9g and 10 cents each, but =
ideally I'd like to find something where each mass is somewhere between =
20 g to 50 g, and less expensive :).
>=20
> I appreciate any ideas you may have,
>=20
> Karen Hunter

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I am =
putting together some experiments on the topics of forces and simple =
machines to do with the 3rd graders at our local elementary school, and =
I'm in need of suggestions for inexpensive objects to use for masses / =
weights. I bought a box of washers, which were about 9g and 10 =
cents each, but ideally I'd like to find something where each mass is =
somewhere between 20 g to 50 g, and less expensive :).I =
appreciate any ideas you may have,Karen Hunter=
=

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From tap-l-owner@lists.ncsu.edu Wed Feb 9 19:57:53 2011