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प्रश्न
What is the law of floatation?
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उत्तर
A body will float in a liquid if the weight of the body is equal to the weight of the liquid displaced by it.
Key Points:
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Buoyant Force:
- When a body is partially or fully submerged in a liquid, it experiences an upward force called the buoyant force.
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Condition for Floating:
- For a body to float, the buoyant force must equal the weight of the body.
- This happens when the density of the body is less than or equal to the density of the liquid.
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Stable Floating:
- In equilibrium, the body displaces an amount of liquid whose weight is exactly equal to its own weight.
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संबंधित प्रश्न
What is upthrust ?
Name the scientist who gave he magnitude of buoyant force acting on a solid object immersed in a liquid.
What is the unit of relative density?
How does the pressure exerted by thrust depend on the area of surface on which it acts? Explain with a suitable example.
Why do sea divers need special protective suit?
Complete the following sentence :
Pressure at a depth h in a liquid of density p is ......................
A block of iron of mass 7.5 kg and of dimensions 12 cm × 8 cm × 10 cm is kept on a table top on its base of side 12 cm × 8 cm.
Calculate:
- Thrust and
- Pressure exerted on the table top
Take 1 kgf = 10 N.
State whether true or false. If false, correct the statement.
The weight of fluid displaced determines the buoyant force on an object.
Higher Order Thinking Skill.
How does a fish manage to rise up and move down in water?
Assertion (A): The buoyant force on a submerged rigid object can be considered to be acting at the center of mass of the object.
Reason (R): In rigid body, force distributed uniformly through its volume can be considered to be acting at the centre of mass of the body.
