Physics Notes For 9th Class English Medium PDF Download
Physics Notes For 9th Class English Medium PDF Download Free read online Physics ninth Class 9 notes English Medium for Pakistani students. Topic in this Notes Motion, Top Formulas, Force and Laws of Motion, Work and Energy, Sound, Gravitation. Some words from this note are 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 gravitational constant, Gravitation is 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 reference point is a fixed point with respect to which a body is at rest or in motion. Rest and Motion are relative terms. The sound is a wave motion, produced by a vibrating source.
A medium is necessary for the propagation of sound waves. The sound is a longitudinal wave in which the particles of the medium move 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.
Physical science is a fundamental part of actual science. It can likewise be characterized as the investigation of the laws of nature. Physical science is a logical science that concentrates on the essential laws of nature that keep everything under the control of the universe. These laws of nature rotate around the four fundamental standards which are reality and matter and energy. The essence of this is that material science is really the investigation of the essential parts that make up the universe and the cooperations of these parts, and afterward the examination of different frameworks (counting man-made ones) that work under them.
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