Ix physics full notes chapter 5

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Ix physics full notes chapter 5

  1. 1. GravitationKey Learning:1. According to the law of gravitation the force of attractionbetween any two objects is proportional to the product oftheir masses and inversely proportional to the square of thedistance between them. The law applies to objects anywherein the universe. Such a law is said to be universal.2. Universal gravitational constant3. Gravitation is a weak force unless large masses areinvolved.4. Acceleration with which a body falls towards the centre ofthe earth is called acceleration due to gravity (g).5. The force of gravity decreases with altitude. It also varieson the surface of the earth, decreasing from poles to theequator.6. Mass is the quantity of matter contained in the body.7. Weight of the body is the force with which the earthattracts the body.8. The weight is equal to the product of mass andacceleration due to gravity.9. Mass of a body does not change but weight of a body isdifferent atdifferent places.10. The force acting on a body perpendicular to its surface iscalled thrust.For More School Notes & Projects Visit www.toppersarena.com
  2. 2. 11. The force acting per unit area of the object is known aspressure.12. The upward force exerted by a liquid when a body isimmersed in the liquid is called up thrust or buoyant force.13. Objects having density less than that of the liquid inwhich they are immersed, float on the surface of the liquid.If the density of the object is more than the density of theliquid in which it is immersed then it sinks in the liquid.14. According to Archimedes’ principle, when a body ispartially or fully immersed in a fluid, it experiences an upthrust which is equal to the weight of the fluid displaced bythe body.Top Formulae:For More School Notes & Projects Visit www.toppersarena.com

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