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VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Specialist Mathematics => Topic started by: tazza on September 17, 2011, 03:16:32 pm

Title: Dynamics question
Post by: tazza on September 17, 2011, 03:16:32 pm

What is the least force parallel to the incline, which will pull a body of mass 100 KG up an incline of 30 degrees if the coefficient of friction is 02???

I know this is an easy question, but the limiting equilibrium/frictional questions are the only ones I can't get my head around completely. Any help would be appreciated.

Title: Re: Dynamics question
Post by: DannyN on September 18, 2011, 10:43:26 am

umm here is how i would do this question :P

since they've given you the coefficient of friction, you are then able to find maximum friction. (i believe you meant 0.2)?

F-fricmax=UR
--> 0.2[100cos(30)]=17.32N
therefore if the force is greater than maximum friction then it will be able to move the mass
so a force >17.32

hope this helps and hopefully i didnt make an error