O Levels Physics (5054)•5054/12/M/J/18
Explanation
Pressure inversely proportional to base area Steps:
- Pressure P equals force F divided by area A; F is constant (same mass, so same weight mg).
- With constant F, P is directly proportional to 1/A.
- Graph of P versus A shows hyperbolic decrease: pressure falls as area rises.
- Correct graph is downward curve, not linear or constant.
Why D is correct:
- D depicts P ∝ 1/A, matching the formula for pressure on the table.
Why the others are wrong:
- A shows direct proportion (P increases with A), violating P = F/A.
- B shows linear decrease, but relationship is hyperbolic, not straight-line.
- C shows constant P, ignoring area change with fixed F.
Final answer: D
Topic: Pressure
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