(a(i))[2]
Calculate the pressure produced by the finger on the drawing pin.
(a(ii))[1]
Compare the force applied by the finger to the drawing pin with the force exerted by the drawing pin on the wooden board.
(a(iii))[2]
Explain why the drawing pin goes into the wooden board but not into the finger.
(b(i))[2]
Explain why the water leaves each hole at right angles to the surface of the bag.
(b(ii))[1]
The holes at A and B are the same size. Explain why the water leaves the hole at A faster than it leaves the hole at B.