Experiment Four. Pulling a paper out from under an empty glass.
Water glass full of water.
Sheet of paper 81/2 x 11 is good
Place the sheet of paper so 1/3 is on the table and 2/3 is sticking
off the edge. Place the glass of water on the paper. The object
is to remove the paper without touching the water glass or spilling the
water. Note that if you pull the paper slowly the glass moves with
To remove the paper hold the loose end firmly with one hand and with
your other hand held vertical strike the paper between your hand and the
table. You need a very fast karate chop type blow to pull the paper
out as fast as possible. This will allow the paper to be removed
with the glass unmoved. The reason this works is again F =
M x A. That is the mass of the water and the glass is very resistant
to a extremely quick motion and it will resist it. This is what keeps
the glass in place.
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