# Pilot class-004-The Bernoulli’s principle

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Quiz-004

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Which are the four forces of flight

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When a fluid is displaced from point A to B, the total energy:

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As the velocity of fluid increases

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Potential energy+ Kinetic energy + Pressure =

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When velocity of fluid decreases

The average score is 85%

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### Important Definitions

Law of conservation of Energy: The law of conservation of energy states that energy can neither be created nor be destroyed. Although, it may be transformed from one form to another.

Law of conservation of mass: The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations.

Potential energy: the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.

Kinetic energy: Form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy. Kinetic energy is a property of a moving object or particle and depends not only on its motion but also on its mass. The kind of motion may be translation (or motion along a path from one place to another), rotation about an axis, vibration, or any combination of motions.

Pressure:  is defined as the physical force exerted on an object. The force applied is perpendicular to the surface of objects per unit area. The basic formula for pressure is F/A (Force per unit area). Unit of pressure is Pascals (Pa).

Volume:  is the quantity of three-dimensional space enclosed by a closed surface, for example, the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains. Volume is often quantified numerically using the SI derived unit, the cubic metre.

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