A student pushes a drawing pin into a notice board with their thumb.
State the equation linking pressure, force normal to a surface and area of that surface.
The student pushes on the head of the drawing pin with a force of 15 N.
The area of the head of the drawing pin is 0.00010 m2.
Calculate the pressure on the student's thumb.
The same force acts on the point of the drawing pin.
Explain why the point of the drawing pin goes into the notice board but the head of the drawing pin does not go into the student's thumb.
132 exam-style questions on Edexcel GCSE Physics 15.2 Pressure in fluids, covering 15.2.1 Atmospheric pressure and height, 15.2.2 Pressure in fluids, 15.2.3 Pressure, force and area, 15.2.4 Pressure and depth, 15.2.5 Pressure in liquids: depth and density, 15.2.6 Upthrust, and 15.2.7 Floating and sinking. Each one has a worked solution and a mark scheme showing where the marks go.