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*From*: Dave Hamilton <djhamil@teleport.com>*Date*: Sun, 31 Mar 96 15:46:54 -0800

Fun thought experiment: what would happen if you release a -1kg ball? Both

the

gravitational mass and inertial mass are negative. Your immediate response

probably isn't correct.)

JEG

Since F=mg, and g is downward and m is neg., then the force would be

upward. Then, since a =F/m, F is upward, and m is negative, the

acceleration is downward. So it would behave exactly the same as when

grav. and inertial mass are both positive (but only for this special

case, we can't have friction, for example, adding to an object's

acceleration, can we?).

Am I right? :)

Having fun,

Dave

David J. Hamilton, Ed.D. "And gladly wolde he lerne,

Franklin HS, Portland, OR and gladly teche."

djhamil@teleport.com Geoffrey Chaucer

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