A drawing pin (thumbtack) has a sharp point with a very small surface area. What is the reason for this?
A small surface area increases the pressure exerted on the board.
A small surface area increases the force applied to the board.
A small surface area decreases the density of the metal.
A small surface area prevents the metal from rusting.
188 exam-style questions on CIE IGCSE Physics Pressure, covering Pressure. Each one has a worked solution and a mark scheme showing where the marks go.