PowerPoint Presentation

Gravitation.

Index. Isaac newton's discovery Gravitation Universal Law of Gravitation Importance of the universal law of Gravitation Free Fall To calculate the value of G Mass Weight Weight of an object on the Moon Thrust and Pressure Pressure in Fluid Buoyancy Why object float or shrink when placed on the surface of water Archimedes' principle Relative Density.

Isaac newton's discovery. Legend has it that Isaac Newton formulated gravitational theory in 1665 or 1666 after watching an apple fall and asking why the apple fell straight down, rather than sideways or even upward..

Gravitation. Gravitation is the force of attraction between two objects in the universe..

Universal Law of Gravitation. Universal law of gravitation :-.

Importance of the universal law of Gravitation. Importance of the universal law of gravitation:-.

Expert Opinion on Deadly Free Fall - Beachcombing's Bizarre History Blog.

To calculate the value of G. To calculate the value of g, we should put the values of G, M and R namely, universal gravitational constant, G = 6.7 x 10 - 11 x N m 2 kg - 2 mass of the earth, M = 6 x 10 24 kg, and radius of the earth, R = 6.4 * 10 6 m. g = G M/R 2 = (6.7 x 10 -11 x N x m 2 x kg - 2 x 6 x 10 24 kg)/((6.4 x 10 6 m) 2 = 9.8m s - 2 . Thus, the value of acceleration due to gravity of the earth, g = 9.8 m s - 2 ..

Mass. Mass:- The mass of a body is the measure of its inertia. If the mass of a body is more .its inertia is more. The mass of a body is constant and does not change from place to place. The SI unit of mass is kg..

Weight. Weight:- The weight of a body is the fore with which the earth attracts the body. The force with which a body is attracted by the earth depends on its mass m and acceleration due to gravity g. F=m x g Since weight of a body is the force with which the earth attracts the body, W=m x g Since g at a place is constant, W ∝ m The weight of a body changes from place to place. The SI unit of weight is the same as force - Newton (N)..

Weight of an object on the Moon. Moon - Wikipedia.

Thrust and Pressure. a) Thrust :- Thrust is the force acting on an object perpendicular to the surface. Eg :- When you stand on loose sand the force (weight) of your body is acting on an area equal to the area of your feet. When you lie down, the same force acts on an area equal to the contact area of the whole body. In both cases the force acting on the sand (thrust) is the same. b) Pressure :- Pressure is the force acting on unit area of a surface. Pressure =Thrust/Area Eg :- The effect of thrust on loose sand is larger while standing than while lying down. The SI unit of thrust is N/m 2 or N m -2 . It is called Pascal (Pa)..

Pressure in Fluid. How Water Works | HowStuffWorks.

Buoyancy. Buoyancy Testing: Will it Sink or Float? - ScienceWorks.

Different Types of Floating in Water | livestrong.

Archimedes' principle. Archimedes’ principle states that, ‘ When a body is partially or fully immersed in a fluid it experiences an upward force that is equal to the weight of the fluid displaced by it.’ Archimedes principle has many uses. It is used in designing ships and submarines, Hydrometers used to determine the density of liquids, lactometers used to determine purity of milk etc ..

Relative Density. Density - Wikipedia. I) Density :- The density of a substance is the mass per unit volume of the substance. Density =mass/Volume The unit of density is kilogram per metre cube (kg m -3 ). ii) Relative density :- The relative density of a substance is the ratio of the density of a substance to the density of water. Relative density =Density of a substance/Density of water Since relative density is a ratio of similar quantities, it has no unit..

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