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Floatation | Thrust and Pressure | Class 9
Thrust and Pressure The force acting on an object perpendicular to the surface is called thrust. That us understand the meaning of thrust and pressure practically. Situation-1: You fix a poster on a notice board and while doing so you need to press drawing pins with your thumb. So pressing drawing pins means applying force…
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Gravitation | Mass, Weight and Weightlessness | Class 9
MASS The mass of a body is the quantity of matter contained in it. Mass is a scalar quantity. The unit of mass is kilogram. A body contains the same quantity of matter whether it be on the earth, moon or even in outer space. Thus, the mass of a body is constant and does…