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A pet mouse sleeps near the eastern edge of a stationary, horizontal turntable that is supported by a frictionless,
vertical axle through its center. The mouse wakes up and starts to walk north on the turntable. Is the momentum of the system constant?
i understand that the initial momentum is zero, because the turntable and the mouse have v=0, and that the final momentum is not zero, since v≠0 for the mouse, and v=0 for the turntable, so linear momentum is not conserved, but since ∫∑Fext dt=dp, where is the external netforce (∑Fext) that causes the change in the system's momentum? It seems to me there are none. only internal forces (friction) between the mouse and the turntable
vertical axle through its center. The mouse wakes up and starts to walk north on the turntable. Is the momentum of the system constant?
i understand that the initial momentum is zero, because the turntable and the mouse have v=0, and that the final momentum is not zero, since v≠0 for the mouse, and v=0 for the turntable, so linear momentum is not conserved, but since ∫∑Fext dt=dp, where is the external netforce (∑Fext) that causes the change in the system's momentum? It seems to me there are none. only internal forces (friction) between the mouse and the turntable