PHYSICS

Understanding Bernoulli's Principle

Have you ever thought why birds can fly so efficiently in the air?
or likewise the plane?

that movement or phenomenon can be explained by Bernoulli's Principle.

Bernoulli's Principle states that as the speed of a moving fluid increases, thepressure within the fluid decreases.
Therefore, the pressure in a moving fluids depends on its flow velocity (remember fluids =  water, air)

A full definition of Bernoulli's Principle is:

IN a steady flow of a fluid, the pressure of the fluid decreases when the velocity of the fluid increases.

Bernoulli's principle is very important as it is used in the design of airplanes, boat hulls, fan blades and cars.

Example of situations that involves Bernoulli' s Principle:

Ping Pong Balls and Funnels

An inverted filter funnel can hold a ping pong ball if you blow air through the funnel, it does not drop down. Thats because the air flows around the ping pong ball at high speed and creating  a low-pressured area, the higher atmospheric pressure supports the ball from falling.

PHYSICS

What is Physics?

Physics is a branch of science which studiesphysical and natural phenomena around us.








Inertia

" I will remain here if there are no external forces (human , wind , water) acting on me."

"My skateboard will continue to move if there is nobody (external force) to stop it."

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BASE QUANTITIES

Physical Quantities

1. A physical quantity is a quantity that can be measured.
2. A physical quantity can be divided into base quantity and derived quantity.

Base Quantities

1. Base quantities are the quantities that are conventionally accepted as functionally independent of one another.
2. It is a quantity that cannot be defined in term of other physical quantity.
3. The base quantities and its units are as in the table below:

INERTIA

The vis insita, or innate force of matter, is a power of resisting by which every body, as much as in it lies, endeavours to preserve its present state, whether it be of rest or of moving uniformly forward in a straight line.Inertia is the resistance of any physical object to a change in its state of motion or rest, or the tendency of an object to resist any change in its motion. It is proportional to an object's mass. The principle of inertia is one of the fundamental principles of classical physics which are used to describe the motionof matter and how it is affected by applied forces. Inertia comes from the Latin word, iners, meaning idle, or lazy. Isaac Newton defined inertia in Definition 3 of his Philosophiæ Naturalis Principia Mathematica, which states:^[1]

In common usage the term "inertia" may refer to an object's "amount of resistance to change in velocity" (which is quantified by its mass), or sometimes to its momentum, depending on the context. The term "inertia" is more properly understood as shorthand for "the principle of inertia" as described by Newton in his First Law of Motion; that an object not subject to any net external force moves at a constant velocity. Thus an object will continue moving at its current velocity until some force causes its speed or direction to change. An object that is not in motion (velocity = zero) will remain at rest until some force causes it to move.

On the surface of the Earth inertia is often masked by the effects of friction and gravity, both of which tend to decrease the speed of moving objects (commonly to the point of rest). This misled classical theorists such as Aristotle, who believed that objects would move only as long as force was applied to them.^[2]