Question

Define the term upthrust as applied to Archimedes

Answer 1

Answer:

Push an empty can in water. You will feel an upward force and you will find it difficult to push the can further. Water exerts force on the can in the upward direction. When a body is immersed in a liquid, the liquid exerts an upward force on the body. This force is called the upthrust or buoyant force.

Why do you feel lighter when you are in a swimming pool? This is due to upthrust. The effect of upthrust is that weight of the body immersed in a liquid appears to be less than its actual weight. There are two factors on which upthrust depends - Volume of the body and Density of the Liquid. Larger the volume of body submerged in liquid, greater is the upthrust. More the density of liquid, greater is the upthrust.

Upthrust = Volume of body x density of liquid x acceleration due to gravity.

Learn why bodies with density greater than density of liquid sink while body with density less than density of liquid float.

You can find out the magnitude of the upthrust by Archimedes' Principle. Archimedes' Principle states that when a body is immersed partially or completely in a liquid, it experiences an upthrust, which is equal to the weight of the liquid displaced by it. This principle is applied to liquids as well as gases

Answer 2

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if you try to lift up a weight in a swimming pool and then try to lift the same weight on the edge of the pool, it feels much lighter in the water.

This was supposed to have been first explained by the Greek scientist Archimedes. He said that the water gives an upward force or upthrust on any object in it.

You can weigh an object in air and then in water and actually work out the upthrust, it is the difference between the two readings. For this reason the upthrust is often called the loss in weight of the object.

Archimedes principle states that: 

When a body is partly or totally immersed in a fluid there is an upthrust that is equal to the weight of fluid displaced.

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