IB Physics SL B 3 1 Pressure Questions

Practise IB Physics SL B.3.1 by calculating pressure from force, area, density and depth in everyday and fluid situations.

Exam points

Apply p=F/A and pressure differences to calculate forces and their direction on surfaces and doors.
Derive and use hydrostatic pressure ρgh with density, depth and area in fluid situations.
Comment on the magnitude of a pressure-derived force by identifying an unrealistic assumption or the mechanism that changes the effective force.

[Maximum number: 2]

A solid cylinder of height h and density $\rho$ rests on a flat surface.

Show that the pressure $p_{\mathrm{C}}$ exerted by the cylinder on the surface is given by $p_{\mathrm{C}}=\rho g h$ .

weight of cylinder $=A h g \rho$ $\text { pressure }=\frac{F}{A}=\frac{A h g \rho}{A}$

Marking guidance:

Allow use of $A=\pi r^{2}$ in MP1.

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