Question

Pressure for air and fluids can be measured and used to fly, float, blow, suck or coast according to specific laws and principles. Terminology can change for the same actions if used with water or with air.

1) These terms are used in the chapter. Give an example of an item that illustrates your definition. Is there a formula or measurement unit that is commonly used?

give an Example & Formula of each term

Newton's 1st law of Motion

Newton's 2nd law of Motion

Newton's 3rd law of Motion

Hooke’s Law

Pascal’s Law

Bernoulli Principle

LaPlace’s Law

Archimedes Principle

Answer 1

For pressure, we generally use Pascal (Pa) or atmosphere (atm). General formula is P = F/A

a) Newton's 1st law of motion: When we are traveling by a bus or a car, and it suddenly stops, we lean forward, it is due to inertia of motion which is contained in this law.

b) Newton's 2nd law of motion: Formula is F = ma

We pull our hands down while catching a ball, We do this to increase the time the ball takes to get stopped, so that its momentum change takes more time to become zero, and thus we get less force from the ball hitting our hands.

c) Newton's 3rd law of motion: When we fire a bullet from a gun, bullet goes in the forward direction but the gun also comes backward a little.

d) Hooke's law: Extension in the spring is directly proportional to restoring force developed in the spring.

To give more extension, we would have to apply greater force.

e) Pascal's law: One of the best examples is hydraulic lift. Small force applied on a smaller piston creates a much larger force on the bigger piston which helps in lifting the objects easily.

f) Bernoulli's principle: During windstorms, the roofs of the houses are blown upward and not in downward direction as we would generally expect.

  

g) LaPlace's law: More is the vessel radius, the larger is the wall tension required to hold a given internal fluid pressure.

h) Archimedes principle: A boat made of steel and also containing several tonnes of weight is able to float over water surface. It is due to the concept of buoyant force.