Extra Explaining Question - ARCHIMEDES PRINCIPLE AND LAW OF FLOTATION

ARCHIMEDES PRINCIPLE AND LAW OF FLOTATION

1. When answering exam question a student wrote the following.
   ‘A cork floats on water because it is lighter than water. A stone sink because it is too heavy to floats on water’
   Correct the mistakes in the student’s answer.
   [Show answer]

   A cork floats in water beacuse its density is less than that of water. A stone sink in water because its density is larger than that of water
2. Briefly explain why it is easier to lift a stone of 50 kg when in water than it does in air.
   [Show answer]

   It is easier to lift a stone of 50 kg when in water than it does in air because of Upthrust (Buoyancy). The Upthrust reduces the effective weight of a body. The Upthrust exerted by water is greater than that exerted by air that can be negligible.
3. Explain why an object weigh less in water compared to its true weight.
   [Show answer]

   The object weigh less in water compared to its true weight because of Upthrust exerted on the object by water. The Upthrust acting upward reduces its weight when submerged.
4. Why does a solid body weight more in air than show increased in a liquid?
   [Show answer]

   Solid body weigh more in air than when immersed in liquid because of the Upthrust. The Upthrust exerted by liquid tends to reduce the weight of the body.