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F net = T
F net = T

... Newton's Second Law tells us that rate of increase (or decrease) in the speed of something which is moving is proportional to the force acting on it. Imagine that you are riding a bicycle along a perfectly smooth and level road and you decide to stop pedaling. If there is a strong wind pushing agai ...
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... values are listed as multiples of g on Earth in Table Differences between Mass and Weight Mass is measured in kilograms (kg) and is the amount of matter in an object. An object's mass does not change unless matter is added or removed from the object.The differences between mass and weight can ...
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... of the Earth’s crust in an effort to warn us of impending catastrophes. But the big sounds that accompany such phenomena as earthquakes and volcanic eruptions are not all that you can detect with a seismograph. You can also hear background whispering of the Earth’s crust – the so-called ‘seismic noi ...
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... • Traveling only through the crust, surface waves are of a lower frequency than body waves, and are easily distinguished on a seismogram as a result. • Though they arrive after body waves, it is surface waves that are almost entirely responsible for the damage and destruction associated with earthqu ...
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Seismometer

Seismometers are instruments that measure motion of the ground, including those of seismic waves generated by earthquakes, volcanic eruptions, and other seismic sources. Records of seismic waves allow seismologists to map the interior of the Earth, and locate and measure the size of these different sources.The word derives from the Greek σεισμός, seismós, a shaking or quake, from the verb σείω, seíō, to shake; and μέτρον, métron, measure and was coined by David Milne-Home in 1841, to describe an instrument designed by Scottish physicist James David Forbes.Seismograph is another Greek term from seismós and γράφω, gráphō, to draw. It is often used to mean seismometer, though it is more applicable to the older instruments in which the measuring and recording of ground motion were combined than to modern systems, in which these functions are separated.Both types provide a continuous record of ground motion; this distinguishes them from seismoscopes, which merely indicate that motion has occurred, perhaps with some simple measure of how large it was.The concerning technical discipline is called seismometry, a branch of seismology.
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