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newtons laws are always valid in non inertial frames
An inertial frame of reference = constant vel. non inertial frame of reference = acceleration
Is earth an inertia or non inertial frame of reference? plz do reply as soon as possible
An inertial frame of reference (FOR) is a non-accelerating FOR , for example if a person is observing a moving car while at rest or while moving at constant velocity, he is in an inertial FOR. A non-inertial frame of reference is an accelerating FOR for example a rotating FOR. ( Rotation requires centripetal force and centripetal acceleration so any rotating object always requires a centripetal acceleration to rotate.)
It's unfortunate that this system does not allow mathematical notation, so these have to be at least partly spelled out. Some definitions: t0 refers to time interval as measured in an inertial frame t refers to the relative non-inertial time measurement m0 and m for mass, and L0 and L for length (along the direction of travel) follow the same pattern t = t0/the square root of [1-(v/c)2] m = m0/the square root of [1-(v/c)2] L = L0{the square root of [1-(v/c)2]} The lorentz transformations, by definition, compare the relationship between non-inertial frames and their designated inertial reference frames.
Non inertial
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Forces are the only things that can change an object's speed or direction, if both you and the object are in appropriately chosen inertial reference frames. If you or the object are in a non-inertial frame (or frames), then the object's speed and direction can change with no cause at all. It's like magic. This actually happens in everyday life, in subtle ways, owing to things like the earth's rotation and its revolution around the sun. The effects are small so you don't feel them, but if you watch for a long, long time, you can detect changes of speed and direction that are best explained by these causes that we do not easily perceive.
Prior to Einstein's special theory of relativity, it was generally believed that there existed some true, objective frame of reference, in which you could measure the true, absolute speed of any moving item, including light. This frame of reference was often imagined to be connected to something called the luminiferous ether (or ether for short) which was thought to be some mysterious substance, which could not be detected by most means, but which permeates the universe and which acts as a medium for the transmission of light, in the same way that air is a medium for the transmission of sound. The ether, if such a thing existed, would be motionless and would define the truest or most objective reference frame. Einstein proposed that there is no ether, and that there is also no special frame of reference. The motion of any object can only be determined with respect to a given frame of reference; there is no such thing as absolute motion that is objectively true, and superior to other reference frames.** For further study: there are inertial and non-inertial reference frames.====================================Answer #2:No.Easily understood examples of relativistic effects in familiar situations canbe presented, but the statement of the theory itself can't be expressed inlaymen's terms.