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How does Newton's 3rd law apply in solving relative acceleration?
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[QUOTE="kuruman, post: 5560090, member: 192687"] If there is no friction and assuming some kind of propulsion like a propeller or a jet engine, the body will move relative to the ground but the platform will not because the platform is not attached to the platform in the horizontal direction. In this case, the platform's role is to exert a normal force to keep the body in place vertically. If there is friction, there are equal and opposite horizontal forces that accelerate each mass horizontally. The fact that you got the right answer without needing the coefficient of friction is no coincidence, but as it should be. You can see this quite easily if you consider momentum conservation of the body+platform system. Because there are no horizontal external forces acting on the components of this system, the horizontal acceleration of the center of mass is zero, m1*a1+m2*a2 = 0. This will give you a relation between the accelerations relative to the ground which you can then relate to the given a = 6.3 m/s[SUP]2[/SUP] as you have already done. [/QUOTE]
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How does Newton's 3rd law apply in solving relative acceleration?
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