Asked by John

A boy is trapped in a large area of very soft mud. A man rescues the boy by crawling across a long, light board rather than by walking into the mud. What effect, if any does the board have on the force and the pressure on the mud, compared with walking?

A. force and pressure is decreased
B. force is decreased; pressure is unchanged
C. force is unchanged; pressure is decreased
D. force and pressure is unchanged
Answered by bobpursley
answer C is correct. You need to think on that, and understand the role of area in reducing pressure from a force.
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