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Introductory Physics Homework Help
Hanging mass on a massless pulley
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[QUOTE="kasnay, post: 6812460, member: 701047"] [B]Homework Statement:[/B] A 3.5kg block is on a tabletop and is attached by a string to hanging block of mass 2.8 kg. The blocks are released from rest and allowed to move freely. If the table has a coefficient of friction of 0.4 A) Find the Acceleration [B]Relevant Equations:[/B] fnet x and fnet y I have a conceptual question about this problem. I can write the 3.5 kg block equation as Fnet(block 1)=(Force of tension)-(Force of friction)=m1a I can write the 2.8 kg block as Fnet(block 2)=(Force of tension)-(Force of gravity2)=m2a My question is this If I set the forces of friction equal I get the wrong answer. However If I assume the fnet of block 2 is negative (because its going to fall) I get the correct answer. Why do I need to assume the second block fnet is negative? Shouldnt the math already account for what needs to happen? [/QUOTE]
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Introductory Physics Homework Help
Hanging mass on a massless pulley
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