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Work, Power and Energy Class 9 Notes Science Chapter 11 Facts that Matter Work: When a force acts on an object and the object shows displacement, the force has done work on the object. Two conditions need to be satisfied for work to be done: (i) A force should act on object (a) The object [...]
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Gravitation Class 9 Notes Science Chapter 10 Facts that Matter The universal law of gravitation: Every object in the universe attracts every other object with a force which is proportional to the product of their masses and inversely proportional to the square of the distance between them. The force is along the line joining the [...]
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Force and Laws of Motion Class 9 Notes Science Chapter 9 Facts that Matter Force: It is a push or pulls on an object that produces an acceleration in the body on which it acts. S.I. unit of force is Newton. A force can do three things on a body. It can change the speed [...]
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Motion Class 9 Notes Science Chapter 8 Facts that Matter An object is said to be in motion when its position changes with time. We describe the location of an object by specifying a reference point. Motion is relative. The total path covered by an object is said to be the distance travelled by it. [...]
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Diversity in Living Organisms Class 9 Notes Science Chapter 7 Facts that Matter Diversity: This earth is full of organisms of various shapes and sizes. The largest Phylum of animal kingdom alone contains over a million species. There are varieties of plants, right from small grasses to tall Eucalyptus trees. This variety in living beings [...]
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Tissues Class 9 Notes Science Chapter 6 Facts that Matter Tissues Group of cells having a common origin and similar function are termed as tissues. A. Plant tissues: On the basis of the dividing capacity, plant tissues are of two types: Meristematic tissues Permanent tissues 1. Meristematic tissues: Consist of actively-dividing cells. Meristematic tissues are [...]
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The Fundamental Unit of Life Class 9 Notes Science Chapter 5 Facts that Matter The smallest functional unit of life is a cell, discovered by Robert Hooke in 1665. A cell can independently perform all necessary activities to sustain life. Hence cell is the basic unit of life. There are two types of cells plant [...]
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Structure of the Atom Class 9 Notes Science Chapter 4 CBSE Class 9 Science Notes Chapter 4 Structure of the Atom Facts that Matter John Dalton assumed that atom is indivisible. In 1866 E. Goldstein discovered the presence of new radiations in a gas discharge tube and called them canal rays. These rays were positively [...]
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Atoms and Molecules Class 9 Notes Science Chapter 3 Facts that Matter Law of Chemical Combination Given by Lavoisier and Joseph L. Proust as follows: 1. Law of conservation of mass: Mass can neither be created nor destroyed in a chemical reaction. e.g., A + B → C + D Reactants → Products Mass of reactants [...]
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Is Matter Around Us Pure Class 9 Notes Science Chapter 2 Facts that Matter Compounds The compound is a pure substance made up of two or more elements combined chemically in a definite ratio. Characteristics: The properties of compound differ from those of its constituents. Compound has fixed melting point and boiling point. Compound is [...]