8. What is the difference between pressure and thrust?Write the formula
and units for both
Answers
Answer:
Thrust:
1. The force exerted by the body perpendicular to the surface is known as thrust.
2. SI unit of thrust is newton (N)
Pressure:
1.Thrust acting on unit area is called pressure, i.e.
Pressure (p) = Force / Area (A)
2.SI unit of pressure is Pascal (Pa).
Answer:
thrust:
You may have noticed that when you submerge something in water it appears to weigh less. If you have gone swimming, you feel as though your weight has reduced. This is because any fluid applies an upward force on a body submerged in it. This force is called thrust. This force is in the opposite direction to the force of gravity. Hence, it reduces the total force acting downwards due to gravity on the object and you feel as though your weight has reduced.
pressure:
Pressure is defined as the force per unit area. If a force F is applied on a surface of area A, then the pressure P is defined as:
P = FA
As you blow up a balloon, it becomes harder to blow the balloon as it becomes bigger and bigger. This is because the air pressure inside the balloon is increasing. Pressure is expressed in N/m2 which is also called a Pascal (Pa).
In fluids this pressure is always perpendicular to the surface of an object. It is this pressure that is applied on an object submerged in water that forms the thrust force.
The pressure applied by the fluid is:
Pressure = ThrustArea
Also,
1 Pascal (Pa) = 1 Newton (N)1 Metre square (m2)
Or
Thrust = Pressure × Area
This pressure which produces a thrust on the object is the reason some objects float in water. It is also the reason why objects weigh less in water. To know why objects float or sink, see our article on the Archimedes Principle.