upthrust and buoyancy

Buoyancy - A cork is pushed down into water kept in a glass. We find that as soon as it is released, the cork rises on its own and comes to the surface. Pressure pushes cork upwards To keep it beneath the surface of water, we have to exert downward force. This means that, when the cork is..

Principle of Flotation - When a body floats in a fluid, it displaces an amount of fluid equal to its own weight. The apparent weight of a floating body is zero. Hydrometers and submarines use the principle of flotation. Words to Remember:- Fluid, Atmospheric Pressure, Barometer, Buoyancy,..

Archimedes' Principle - An iron needle sinks in water but a huge ship floats on the surface of water. All objects whether inside the liquid (or fluid) or partially inside, appear to be lighter than in air. This is because liquids (or fluids) exert upward force on the immersed object. This is called..

A submarine sinks by taking water into its buoyancy tanks. Once submerged, the upthrust is unchanged, but the weight of the submarine increases with the inflow of water and it sinks faster. Compressed air is used to blow water out of the tanks when it has to resurface. (An ..