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Forces in Fluids Textual Questions and Answers
1. Take water in a bucket. Place a tightly closed bottle on it. What do you observe?
Ans: Bottle floats on water surface
2. Immerse the plastic bottle to the bottom of the bucket. Don’t you have to exert a force? Why is it so?
Ans: It is because water exerts an upward force
3. Leave the bottle free. What do you observe?
Ans: Bottle rises to the surface of water.
4. When an object in water is lifted, what happens? What can be the reason?
Ans: When an object in water is lifted, its weight appears diminished, when compared to that in air. It is because water exerts an upward force on a body placed in it.
Fluids: Liquids and gases together are generally called fluids.
Buoyancy: When a body is immersed completely or partially in a liquid, the liquid exerts an upward force on the body. This force is the buoyancy.
5. Tabulate some situations in your daily life where buoyant forces are experienced in liquids and gases.
Ans:
To Measure Buoyancy?
Experiment:
Aim: To find method to measure the buoyancy experienced by a body in a liquid.
Materials: Stone, piece of metal, water, beaker, spring balance.
Procedure: Take a piece of stone and a piece of metal of almost the same size. Find out the weight of each in air using a spring balance calibrated in newton. Then find the weight of each of them when immersed in water. Record the data obtained in table. 
Observation: The stone and the metal piece lose weight in water.
Conclusion: Buoyancy is the same as the loss of weight experience in water. That is in order to calculate the buoyancy experienced by a substance immersed in a fluid, it is enough to find out the loss of weight of the substance in that fluid.
Buoyant force of liquid = loss of weight
1. Take water in a bucket. Place a tightly closed bottle on it. What do you observe?
Ans: Bottle floats on water surface
2. Immerse the plastic bottle to the bottom of the bucket. Don’t you have to exert a force? Why is it so?
Ans: It is because water exerts an upward force
3. Leave the bottle free. What do you observe?
Ans: Bottle rises to the surface of water.
4. When an object in water is lifted, what happens? What can be the reason?
Ans: When an object in water is lifted, its weight appears diminished, when compared to that in air. It is because water exerts an upward force on a body placed in it.
Fluids: Liquids and gases together are generally called fluids.
Buoyancy: When a body is immersed completely or partially in a liquid, the liquid exerts an upward force on the body. This force is the buoyancy.
5. Tabulate some situations in your daily life where buoyant forces are experienced in liquids and gases.
Ans:
- A hydrogen-filled balloon rises in the air.
- Ships float on the surface of water.
- Submarines work by controlling the upthrust of water.
- While drawing water from well, weightlessness is felt when the bucket is underwater level.
- Life jacket floats on the surface of water.
To Measure Buoyancy?
Experiment:
Aim: To find method to measure the buoyancy experienced by a body in a liquid.
Materials: Stone, piece of metal, water, beaker, spring balance.
Procedure: Take a piece of stone and a piece of metal of almost the same size. Find out the weight of each in air using a spring balance calibrated in newton. Then find the weight of each of them when immersed in water. Record the data obtained in table.
Observation: The stone and the metal piece lose weight in water.
Conclusion: Buoyancy is the same as the loss of weight experience in water. That is in order to calculate the buoyancy experienced by a substance immersed in a fluid, it is enough to find out the loss of weight of the substance in that fluid.
Buoyant force of liquid = loss of weight
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