6. What is upthrust or buoyant force ?
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It is an upward force exerted by a fluid that opposes the weight of a partially or fully immersed object .
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Upthrust force
An object that is partly, or completely, submerged experiences a greater pressure on its bottom surface than on its top surface. This force is called upthrust . ... An object in a fluid is displacing some of the fluid. The upthrust force is equal in size to the weight of the fluid displaced by the object.
Buoyant force
Buoyancy is the force that causes objects to float. It is the force exerted on an object that is partly or wholly immersed in a fluid. Buoyancy is caused by the differences in pressure acting on opposite sides of an object immersed in a static fluid. It is also known as the buoyant force.
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