Equilibrium of Bodies in Liquids

Physics SSS1 Third Term


Equilibrium of Bodies in Liquids

Performance Objectives

Students should be able to:

  1. Examine the Archimedes’s Principle
  2. State the law of Floatation
  3. Examine Density and Relative density


When a heavy object is immersed in a liquid the object appears to become lighter. Consider the experience when a bucket of water is being drawn out of a well. While still under the water the bucket appears very light and becomes very heavy as soon as it is out of water.

Archimedes explains this showing that when the bucket still in the water, the body is acted upon by an upward force U called upthrust. While still underwater, the equilibrium of the bucket is as: T = W – U.

Where T = tension in the rope.

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