The point from which inertia of an object is calculated.
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
No, an inertial reference frame is not an absolute reference frame. It is a frame of reference in which an object either remains at rest or moves with constant velocity in a straight line, but it is not considered absolute as its motion can be affected by external forces.
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.)
newtons laws are always valid in non inertial frames
It says that the speed of light in a vacuum measured in any inertial frame of reference is equivalent to the speed of light in a vacuum measured in any other inertial frame of reference.
Only in inertial reference frames.
Inertial Navigation System (INS) refers to a system based on dead reckoning, that integrates several sensors in order to calculate your position. If you know your previous position,lets say 1 second ago, and you know your speed and direction then you can determine where you are now. An inertial reference system, in terms of geodesy refers to a coordinate system that does not move with the Earth, it has its axis oriented to fix points outside of Earth. Inertial Reference coordinate systems are used for position of bodies outside of Earth
When you lift a brick and throw it, nobody asks which inertial frame of reference you are using. No.
Because we're rotating with it
If the object is falling down, it is accelerating. "Inertial frames of reference" do not include acceleration, so the falling object can't be considered an inertial frame of reference, according to the Special Theory of Relativity. However, the General Theory or Relativity explores additional complications due to gravity. In any case, if you wish, you can use the object accelerating downward as a reference frame (just don't call it "inertial"); in this case, obviously the room is accelerating upward, compared to the falling object. It all depends what object you choose as your reference frame.
An inertial reference frame is a frame ... a box, a laboratory, a space capsule etc. ... in which Netwon's laws of motion hold true. Example: My office on the earth is not an inertial reference frame. An object in motion doesn't "remain in constant uniform motion without application of an external force", because of air resistance. Also, an object released in the middle of the air doesn't stay there, it accelerates toward the floor.