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Introductory Physics Homework Help
Restrictions on the frame of reference
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[QUOTE="yucheng, post: 6508055, member: 683521"] [B]Homework Statement:[/B] N/A [B]Relevant Equations:[/B] N/A Newton's laws only hold in intertial frames. In general, the center of mass (CM) is accelerating, so it cannot be used as a frame. However, 1. Suppose that CM is accelerating only in the ##\hat{z}## direction. Does this mean that the CM frame is still valid in the ##\hat{x}## and ##\hat{y}## direction? 2. For rotation, suppose we want to find the torque about the CM, and the CM is acclerating in the ##\hat{x}## direction. We find that a torque about CM as origin, ##\tau = f \hat{z}## Is this then a valid frame of reference for torques as long as they are not in the same direction as the acceleration? Context(Kleppner and Kolenkow, Problem 7.6: [ATTACH type="full"]285043[/ATTACH] So the author found the torques around the CM (the black dot), and since the person is moving around a circular track, there is a centripetal acceleration acting on the CM, and so it should not be inertial.P.S. actually, any point that is accelerating with the conditions given, not just CM. Thanks in advance! [/QUOTE]
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Restrictions on the frame of reference
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