If our solar system and galaxy are moving why do we not see differences in speed of light depending on direction? @Math_Whiz your edit makes no sense. How can I show that the speed of light in vacuum is the same in all reference frames? Just keep in mind that the force from the scale acting on the body (which is indicated by the reading on the scale) contributes to (or opposes) any other forces which are causing the body to accelerate. The elevator case is a little different, because in this case, the normal force is the force that will accelerate the person. You must specify this in yur edit. So, the apparent weight is less that the true weight. 1.65 N Given: m = 250 g = 0.25 . This is due to the fact that when the elevator is accelerating up, it is analogous to the frame of reference moving up. How can this be? You are looking at different things, that's why you see differences. Is the second postulate of Einstein's special relativity an axiom? You are standing on a scale in an elevator on the 4th floor of the science building. When the body just starts falling, the velocity is zero and the free body diagram would show only one force acting on the object - gravitational force that pulls the object down. In the elevator the apparent weight is Wa = m (g-a), where a is the acceleration of the elevator. It only takes a minute to sign up. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. If you apply a force on the block that is less than the wight, i.e. $F_\mathrm{app}
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