With the completion of this lesson, students should be able to:
Pressure is defined as force acting per unit area. Its SI unit is Pascal. This note has brief description of pressure.
Pascal's law states that "Pressure exerted by liquid in an enclose vessel is transmitted equally". This law is applicable for the gases also. This is the detailed note on pascal's law and its application in hydraulic press.
Density is a physical property of a matter. It can be defined as a ratio of mass per unit volume. This note gives an information about upthrust and density.
We know that due to upthrust, objects tend to lose weight when immersed in liquid. Archimedes principle states that "If an object is partially or completely immersed in the liquid, the weight of liquid displaced by the object is its upthrust". This notes provides an information about Archimedes principle of grade 10.
The body is immersed in a liquid when the two forces should act. The two forces are: the weight of the body acting vertically downward, and the upthrust on the body acting vertically upward. Depending on these two forces, there arise three cases. First, a body sinks in a liquid only if the density of the body (d1) is greater than the density of the liquid (d2) in which a body is kept. Second, a body just floats on a liquid when the density of the body (d1) is equal to the density of the liquid (d2) in which the body is kept. Third, a body floats keeping some parts of it out when its density (d1) is lesser than that of the liquid (d2) in which it is kept.