i. Force and pressure
|It is the product of mass and acceleration.||It is the total force applied per unit area.|
|Force = m.a||Pressure = F/A|
|Its SI unit is Newton (N).||Its SI unit is Pascal (Pa).|
ii. Archimede's principle and the law of flotation.
|Archimede's principle||Law of flotation|
|It states that when a body is partially or totally immersed in a liquid, it experiences the upthrust equal to the weight of the liquid displaced by it.||It states that a body floats on a liquid if it can displace the liquid equal to its own weight.|
|It is the cause of the law of flotation.||It is a special case of Archimede's principle.|
iii. Upthrust and pressure.
|The resultant upward thrust exerted by fluid is called upthrust.||The total force applied per unit area is called pressure.|
|Upthrust = m.g||Pressure = F/A|
|Its SI unit is N.||Its SI unit is Pa.|
iv. Density and relative density.
|The total mass per unit volume is called density.||The ratio of the density of substance and density of pure water at 40C is called relative density.|
|Density = m/V||R. density = Ds / Dw at 40C|
|Its unit is kg/m3.||It is unitless.|