Why does a child feel more pain when she falls down on a hard cement floor, then when she falls on the soft muddy ground in the garden?

Why does an opaque body form shadow when light falls on it ?

Why does a passenger fall forward when he alights from the moving bus ?

Why does the e.m.f. of a galvanic cell decrease on drawing current from it? When does it fall to zero

Why does the horse rider fall forward when a running horse suddenly stops ?

A metre stick is held vertically with one end on the floor and then allowed to fall.The speed of the other end when it hits the floor(assuming that the lower end does not slip) is :

Why does the column of mereury first fall and then rise when a mercury in glass thermometer is put on a flame?

Under which of the following conditions is a person most likely to fall sick ? when she is recovering from malaria. (ii) when she has recovered from malaria and is taking care of someone suffering from chicken-pox. (iii) when she is on a four-day fast after recovering from malaria and is taking care of someone suffering from chicken-pox. Why ?