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12 December, 11:25

Does the weight of a vehicle get heavier with speed? & why?

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  1. 12 December, 12:34
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    I guess technically it does.

    But the only reason I know of that it should is the relativistic increase

    of mass with speed ... that's why we never notice the increase at

    everyday speeds.

    The effect gets larger at higher speeds. For example, if the car is

    cruising through the neighborhood at 6.71 million miles per hour

    (1% the speed of light), then its mass, and therefore its weight,

    is 0.005% more than when it's sitting still at a red light.

    Now, if the driver were to put the pedal to the metal and open 'er up

    to 10% the speed of light, then the car's mass (and the driver's mass

    too) would increase to a whopping 0.5% more than its 'rest mass'.

    So you would definitely have to say that the vehicle does get heavier

    as it speeds up.
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