Thrust and pressure with animation

helps to understand daily life observation

1. Thrust and Pressure

2. Thrust The force applied on a surface in a direction perpendicular to the surface. SI Unit = Newton (N)

3. Pressure The effect of thrust per unit area is called pressure. Pressure is a scalar quantity. Pressure = thrust/area SI Unit – Pascal (Pa) 1 Pa = 1 N / 1m 2

4. Pressure depends on two factors 1.force(thrust)-more force more pressure 2.area -more area less pressure The same force produces less pressure if it acts on a large area but can produce large pressure if acts on a small area.”

5. E very day observation School bags have wide straps so the weight of bag may fall over a large area of the shoulder of the student producing less pressure on shoulder.

6. Sharp knife cuts better than a blunt knife so the force of our hand falls over a very small area of object produces large pressure.

7. The tractor have broad tyres so there is less pressure on ground and do not sinking to comparatively soft field .

8. It is easier to walk on soft sand if we have flat shoes rather than shoes with sharp heels.

9. The foundations of buildings and dams are laid on a larger area to produce less pressure

10. A wide belt is provided over the wheels of an army tank . The wooden or concrete sleepers are kept below the railway line.

11. Now answer Define thrust. What is its unit? What is the relation between pressure, force and area? Why does a sharp knife cut objects more effectively than a blunt knife? Why the tip of sewing needle is sharp? Why snow shoes stop you from sinking into snow ? A cubical block of edge 2cm and of mass 5kg is kept on a table top. Calculate (a) the thrust of the block on a table top. (b) the pressure of the block on the table top Ans - 49N, 122500Nm -2