# Physics Definitions

just some definitions u might need to know

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• Created by: Braniac
• Created on: 16-06-12 18:57

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Physic Definitions
Fluid: A fluid is defined as any substance that can flow. This normally means any gas
or liquid, but solids made up of tiny particles can sometimes behave as fluids. An
example is the flow of sand through an hourglass.
Laminar Flow (also known as streamline flow) & Turbulent Flow: Laminar flows
occur at lower speeds, and will change to turbulent flow as the fluid velocity
increases past a certain value. The velocity at which this changeover occurs will vary
depending upon the fluid in question and the shape of the area through which it is
flowing.
Eddy: is the swirling of a fluid and the reverse current created when
the fluid flows past an obstacle. The moving fluid creates a space
devoid of downstream-flowing fluid on the downstream side of the
object.
Newtonian Liquid: If a fluid or liquid follows Isaac Newton's
formulae, as most common liquids do, it is known as a Newtonian
Liquid. With scientific investigations, Newton created equations based
on his results to describe the frictional force between the layers in
streamline flow.
Chaos: Chaos theory studies the behaviour of dynamical systems that are highly
sensitive to initial conditions, an effect which is popularly referred to as the butterfly
effect. Small differences in initial conditions (such as those due to rounding errors in
numerical computation) yield widely diverging outcomes for chaotic systems,
rendering long-term prediction impossible in general

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Velocity: The speed of something in a given direction. It is a vector physical quantity;
both magnitude and direction are required to define it
Vector: A quantity having direction as well as magnitude, esp.
as determining the position of one point in space relative to
another.
Speed: Distance travelled per unit time. Speed is the scalar
quantity that is the magnitude of the velocity vector.
Drag: Drag is the aerodynamic force that opposes an object's