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Notes 10. Gravitation - Thrust And Pressure | Class 9 Science - Toppers Study
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Notes 10. Gravitation - Thrust And Pressure | Class 9 Science - Toppers Study
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Chapter 10 Science class 9
Thrust And Pressure class 9 Science Chapter 10. Gravitation
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10. Gravitation
| Thrust And Pressure |
Notes 10. Gravitation - Thrust And Pressure | Class 9 Science - Toppers Study
10. Gravitation
Thrust And Pressure:
Weight: Weight is the force acting vertically downwards.
Thrust: The force acting on an object perpendicular to the surface is called thrust.
Pressure: The force (thrust) exerted by an object per unit area is called pressure. SI unit of pressure N/m2 or N m-2 This unit is known as Pascal, which is denoted by Pa.
Pressure = Thrust/area
Understanding this by a simple example:
lets force (thrust) = 10 N
And Area = 2 m2,
then,
Pressure = 10 / 2 N/m2
= 5 N/m2
if area increases by 5 m2 on same force.
Pressure = 10 / 5 N/m2
= 2 N/m2
We get conclusion that if increases the area on same force
then
Important points:
- The effect of thrust depends on the area on which it acts.
- Area is inverse proportionally to the pressure, It means the same force acting on a smaller area exerts a larger pressure, and a larger area exerts a smaller pressure.
- if larger thrust (force) acting on same area pressure will be larger and smaller thrust acting on same area pressure will be smaller, so relation between thrust and pressure is direct proportionally.
Up thrust or buoyant force depends on:
(i) The size or volume of the body immersed in a liquid.
(ii) The density of the liquid in which the body is immersed.
Other Pages of this Chapter: 10. Gravitation
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