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Introductory Physics Homework Help
String with mass pulling block up frictionless ramp
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[QUOTE="PsychonautQQ, post: 4861598, member: 482086"] [h2]Homework Statement [/h2] A block of mass M has a string of mass m attached to it. A force F is applied to the string and it pulls the block up a frictionless plane that is inclined at an angle theta. Find the force that the string exerts on the block [h2]Homework Equations[/h2] F=ma [h2]The Attempt at a Solution[/h2] Force of the string on the block = Force of the block on the string = N Force applied to string = F acceleration of block = acceleration of string = a[/B] [B]My first equation was the net-force equation for the string: ma = -mg*sin(theta) - N + F[/B] [B]My second equation was the net-force equation for the block: Ma = -Mg*sin(theta) + N[/B] [B]solving for the acceleration in the top equation and plugging it into the second equation gives the following (after a small amount of algebra)[/B] [B]N = (F/m)*(1+M/m)^-1[/B] [B]Which is not the answer I am supposed to be getting. I am guessing the problem is with my net-force equations but I can't located a specific problem. Anyone want to explain what I'm doing wrong here?[/B] [/QUOTE]
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String with mass pulling block up frictionless ramp
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