The hallmark of an inertial reference reame is that any object which is subject to zero net force will travel in a straight line at constant speed. to illistrate this, consider this: i am standing on a level floor at the origin of an inertial frame s and kick a frictionless puck due north across the floor.
a) write down the x and y coordinates of the puck as functions of time as seen from my inertial frame. ( use x and y axes pointing east and north)
now consider two mire observers, the first at rest in a frame s' that travels with constant velocity v due east relative to s, the second at rest in frame s" that travels with constant acceleration due east relative to s. ( all three frames coincide at the moment when i kick the puck, and s"is at restrelative to s at same moment)
b) find coordinates x', and y' of the puck and describe the pucks path as seen from s'.
c) do the same for s".
which frame is inertial?
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