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textvoc physics - 211 Air drag the forces that are in...

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211. Air drag- the forces that are in opposition to the relative motion of an object through the air . 212. Pendulum-a body so suspended from a fixed point as to move back and forth by the action of gravity and acquired momentum. 213. Acceleration of gravity-rate at which an object free falls 214. Friction-surface resistance to relative motion, as of a body sliding or rolling 215. Amplitude-the absolute value of the maximum displacement from a zero value during one period of an oscillation 216. Oscillation-an effect expressible as a quantity that repeatedly and regularly fluctuates above and below some mean value, as the pressure of a sound wave or the voltage of an alternating current. 217. Period-the duration of one complete cycle of a wave or oscillation; the reciprocal of the frequency 218. Isochronisms-an isochronal character/action 219. Center of mass-point representing the mean position of the matter in a body 220. Displacement-the displacing of space by one mass in place of the other
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