Upthrust is a force felt by an object
either immersed or floated on liquid. Upthrust depends upon density of liquid
and cross section area of object that is on contact with liquid.
Q1. Why an egg sinks on tap water but
floats on salt water?
Ans: Egg sinks on tap water because
density of tap water is low and provides little upthrust upon egg which is less
than weight of egg and hence egg sinks. But concentrated salt water has enough
density to provide upthrust that is equal to weight of egg and hence egg floats
on salt water.
Q2. A nail sinks on water but ship made
of metal floats with heavy load why?
Ans: In general nail has higher density
than water and sinks on water but ship made of same material has large area of
contact with water on which water exerts large upthrust and hence floats with heavy
load.
Q3. A ship can carry more load on ocean
than on river why? (Left for student, plz answer in comment)
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