THRUST AND PRESSURE.pptx

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1. THRUST AND PRESSURE NAME: ABHINAV KUMAR AND ISHAAN AGGARWAL ROLL NO.= 40 AND16

2. THRUST “ The force acting on an object perpendicular to the surface is called THRUST”. In other words “ It is the force acting perpendicularly on a surface”. SI unit is N or Newton.

3. PRESSURE “The effect of thrust per unit area” is called Pressure. Pressure =thrust/area SI unit is Pa or Pascal. Pa =N/m².

4. Pressure depends upon 2 factors : Force(thrust)-more force more pressure. Area- more area less pressure . “The same force produces less pressure if it acts on a large area but can produce less pressure if act on a small area”.

5. EVERYDAY OBSERVATION 1. A simple example of pressure may be seen by  holding a knife to a piece of fruit . If you hold the flat part of the knife against the fruit, it won't cut the surface. The force is spread out of a large area (low pressure ).

6. 2. When we are standing, both are feet are in contact with the ground while when we are walking, one of our feet is always in air . Hence, the area in contact with the ground is more when we are standing than when we are walking. Greater the area in contact, lesser would be the pressure.

7. PRESSURE IN FLUIDS FLUIDS : Any substance which can flow due to its internal forces is called FLUIDS. Gases and Liquids are considered as fluids whereas solids are rigid.

8. BUOYANT FORCE : FLOATING PRINCIPLE (BUOYANCY) BOUYANCY: “It is the principle by which the fluid exerts a force in upward direction on the solid object immersed into the fluid ”. This upward force is called Buoyant Force which is also known as UPTHRUST.

9. EXAMPLE

10. ARCHIMEDES `PRINCIPLE “When an object is wholly (or partially) immersed in a liquid, it experiences a buoyant force (or upthrust ) which is equal to the weight of liquid displaced by the object”. In other words Buoyant force (or upthrust )=Weight of the liquid acting on an object displaced by that object

11. APPLICATIONS OF ARCHIMEDES `PRINCIPLE 1.Archimedes` principle is used in determining the relative density of an substance . 2.The hydrometers used for determining the density of liquids are based on Archimedes` principle. 3.The lactometers used for determining the purity of milk are based on Archimedes`principle . 4.Archimedes`principle is used in designing ships and submarines.