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Physical quantities

Magnetism

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Physics
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Magnetism
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Magnetism is the force between magnetic poles, like poles repel opposites attract. Force varies as inverse spuare of distance. Stronger than gravity and there are no such thing as a single pole. Magnetic field lines will always be loops since magnetic fields always have both a North and a South. Compasses will align with the field lines and by convention magnetic force and field go from N to S. All magnetism is caused by accelerating electric charges.

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Newton Second Law

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Newtons Second Law
Newton was the first to mathematically express the relationship between force and momentum. Some physicists interpret Newton's second law of motion as a definition of force and mass, while others consider it to be a fundamental postulate, a law of nature. Either interpretation has the same mathematical consequences, historically known as "Newton's Second Law": The quantity mv is called the (canonical) momentum. The net force on a particle is thus equal to rate change of momentum of the particle with time. Since the definition of acceleration is a = dv/dt, the second law can be written in the simplified and more familiar form:

Uniform accelerated motion vocab

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Velocity
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Speed
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uniform accelerated motion; velocity; speed; slope; acceleration; displacement; distance

Speed: The time rate of motion Slope = change in distance/change in time (rise/run) Scalar: the distance moved per unit of time Average speed (scalar): the ratio of the total distance traveled to the total time Total distance/elapsed time (m/s) Instantaneous speed (scalar): the speed of an object at a particular moment in time The slope of the line that is tangent to the curve at a given point Velocity (vector): speed in a particular direction Average velocity (vector): the total displacement divided by the total elapsed time Displacement /Elapsed time = (?x)/ (?t) Instantaneous velocity: The speed and direction an object moves at a particular moment in time

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