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why is his feet not cut

. The photo shows physics
teacher Marshall Ellenstein
walking barefoot
on broken glass bottles
in his class. What physics
concept is Marshall
demonstrating, and why
is he careful that the broken
pieces are small and
numerous? (The Band-
Aids on his feet are for
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1 Answer

Pressure = Force /Area
If glass pieces are small and spread on large area than weight of the body = force exerted on the floor is spread over large area with many small glass pieces. Each glass piece is subjected to small pressure because weight of the body is spread over many glass pieces. Therefore less piercing force felt by teachers feet.