Conservation of Momentum in Different Inertial Frames (1D)

Newton's law of motion look the same to all observers in inertial frames of reference.

It is equally true that if momentum is conserved in one inertial reference frame,
    it is conserved in all inertial frames.

This java applet apply the above concept to one dimensional collision problem.

Two circular objects are confined to move in one diminution (between two gray blocks).

Press start button to run the animation.

Click the mouse button to pause. Click it again to resume the animation.

While the animation is suspended:

Press Reset to reset most parameters to default values. You can select different frame of reference to view the relative motion of all the objects.
        lab is a laboratory inertial frame.
        m1, m2 and CM are frame of reference with respect to
            left circular object m1,  right circular object m2 and center of mass for m1 and m2.

View collision in 2 dimension.