Answer the following with reference to the physical quantity pressure.
(a) Define pressure in terms of force and area.
(b) A person claims that standing on the heel of a shoe produces more pressure on the ground than standing on the sole of the same shoe. Explain this statement qualitatively on the basis of the definition you have given.
(c) Snowshoes are made broad and flat. Using the same reasoning, explain why snowshoes help a traveller walk on soft snow without sinking deeply.