Lesson: Chapter 15 — Fluid Pressure and Its Applications

15.1. Pressure 4 of 5 Reset answers

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Question 4

An object produces a pressure of 300 Pa over an area of 3 m² of ground. What force does it exert on the ground?

A 303 N B 100 N C 900 N D 30 N

The right answer is the one marked above.

900 N. force = pressure × area = 300 N m⁻² × 3 m² = 900 N.

100 N comes from dividing instead of multiplying. Check the units of the answer — N m⁻² times m² leaves N alone, so multiplying is the right move.

Answer the question to continue.