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Define thrust.
State the factors on which buoyant force depends.
Define relative density. What is its SI unit?
Define pressure.
State the principle of floatation.
Give Reasons for the following :
Why is it difficult to hold a school bag having a strap made of a thin and strong string?
Why does an object float or sink on the surface of water?
Why does a mug full of water feel lighter inside water?
Will the magnitude of upthrust change when more and more volume of a rigid body is immersed in water? When does this upthrust become minimum?
A piece of ice floating in a glass of water melts but the level of water in the glass does not change. How do you account for this?
Density and relative density.
Thrust and pressure.
Upthrust and weight.
Conditions for floatation and sinking of a body.
Archimedes’ principle and principle of floatation.
Describe briefly how can you arrive at Archimedes’ principle theoretically.
How can you determine the relative density of a body using Archimedes’ principle?
Relative density of mercury is 13.6. What is its density in SI unit?
Calculate the mass of a body whose volume is 2 m and relative density is 0.5.
A solid weighs 50 gf in air and 45 gf when completely immersed in water. Calculate
(i) upthrust
(ii) volume of the solid
(iii) relative density of the solid.
A body has a face area of 100 cm and a mass of 100 N is placed on the table. What pressure is it exerting on the table?
A wooden cube of side 10 cm floats in water with 3 cm above the surface of water. What is (i) mass of the cube (ii) density?
Why does a ship float in water even though it is made of steel of density greater than the density of seawater?
It is easier to lift a stone underwater. Explain.
How do snow-shoes prevent us from sinking into snow?
Why cutting instruments are sharpened?
When is the pressure on the ground more when a man is (i) lying (ii) standing on the ground?
A piece of wood is held underwater. The upthrust on it is :
The relative density of a solid is 0.6. It floats in water with :
A balloon filled with hydrogen rises upwards because :
An empty tin container with its mouth closed has an average density equal to that of liquid. The container is taken 2 m below the surface of the liquid and is left there. then the :
The unit of relative density is :
Two balls, one of iron and other of aluminium experience same upthrust when dipped in water.
A wooden cube of side 10 cm has a mass of 700 g. It floats in water with :
Archimedes’ principle states that when a body is totally or partially immersed in a fluid, the upthrust is equal to :
Write true or false for the following statements :
Relative density has no unit.
Archimedes’ principle does not apply to gases.
Any solid will sink in water if its relative density
Pressure exerted by a liquid at a point is the same everywhere in the liquid.
Buoyant force experienced by a body when fully immersed in air is less than that experienced by it in water.
The liquid having higher density exerts more buoyant force on an immersed body than the liquid having lower density.
When an iceberg floats in sea water, only one tenth of its volume is inside the sea water.
A body weighs 500 g in air and 300 g in water, it implies that upward thrust experienced in water is 500 gf.
