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Physics - Relativity Questions and Answers Fully Solved
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Physics - Relativity
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Physics - RelativityEinstein's Special Relativity Postulates - answer1. The laws of physics are the same for
all inertial observers. They can disagree about measurements, but the laws still apply.
2. The speed of light in a vacuum is the same for all inertial observers
Time Dilation - answerClock for person moving seems slower to person at rest than his
own clock.
Length Contraction - answerLength shortens with direction of motion
Lorentz Transformations - answerx' = moving
x = stationary
Speed of Light - answerc. Cannot be surpassed, because as speed increases, mass
increases, so inertia increases, and therefore you can't reach the speed of light.
Einstein's Big Equation - answerE = mc^2. Bigger energy means bigger mass.
Einstein's General Relativity Postulates - answer1. The effects of gravity are the same
as an acceleration (in the opposite direction).
2. If a = 0, any equation should simplify to special relativity (general covariance)
Inertial Mass - answerF to hold up a ball = m x a. m is the tendency to resist change in
motion. Happens in space when an accelerating reference frame makes it seem like
there's a fictitious force downward. The same as gravitational mass.
Gravitational Mass - answerF to hold up a ball = m g. m measures the strength of
gravity (like an electric charge, where the amount of electric force felt depends on
amount of charge. The same as inertial mass.
Inertial Observer on Earth - answerPerson in free fall, because forces cancel each other
out.
-Gravity pulling down
-Accelerating down at -9.8 m/s (causes a fictitious force upwards)
Gravity - answerA fictitious force? The result of curved space. Not really actually
bending space, but mass makes it like there's more space within the plane (so it will
take longer for things to travel through it).
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