English Medium Physics Notes IX, 9th Class
Free Download or read online Physics 9th ninth Class notes English Medium.Topic in this Notes Motion, TopFormulas, Force and Laws of Motion, Work and Energy,Sound, Gravitation.Some words from this notes is Key Learning: According to the law of gravitation the force of attraction between any two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them. The law applies to objects anywhere in the universe. Such a law is said to be universal. Universal gravitationalconstant,Gravitationis a weak force unless large masses are involved.... If the position of an object does not change with time, it is said to be at rest. If the position of an object changes as time passes, it is said to be in motion. The referencepoint is a fixed point with respect of which a body is at rest or in motion. Rest and Motion are relative terms.The soundis a wave motion, produced by a vibrating source. A medium is necessary for the propagation of sound waves.The soundis a longitudinal wave in which the particles of the mediummove along the direction of motion of the wave. The part or region of a longitudinal wave in which the density of the particles of the medium is higher than the normal density is known as compression. The part or region of a longitudinal wave in which the density of the particles of the medium is lesser than the normal density is called a rarefaction.The point of maximum positive displacement on a transverse wave is known as a crest.
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