Physics
Describe an experiment to show that a body immersed in a liquid appears lighter than it really is.
Answer
The weight of body immersed in a liquid appears to be less than it's actual weight due to the effect of upthrust.
Experiment
Lifting of a bucket full of water from a well —
Take an empty bucket and tie a long rope to it. If the bucket is immersed in the water of a well keeping one end of rope in hand and the bucket is pulled when it is deep inside water, we notice that it is easy to pull the bucket as long as it is inside water.
But as soon it starts coming out of the water surface, it appears to become heavier and now more force is needed to lift it.
This experiment shows that the weight of body appears lighter when it is immersed in water than it's actual weight (in air).
Related Questions
Prove that the loss in weight of a body when immersed wholly or partially in a liquid is equal to the buoyant force (or upthrust) and this loss is because of the difference in pressure exerted by liquid on the upper and lower surfaces of the submerged part of the body.
A body held completely immersed inside a liquid experiences two forces (i) F1, the force due to gravity and (ii) F2, the buoyant force. Draw a diagram showing the direction of these forces acting on the body and state the conditions when the body will float or sink.
What do you understand by the term upthrust of a fluid? Describe an experiment to show it's existence.
Describe an experiment to verify Archimedes' principle.