Tuesday, December 14, 2010
Sunday, December 12, 2010
Hints on current homework
In the question about the car stopping: Vf=Om/s. You can use vf^2=vi^2+2aΔx to get x, the stopping distance. To get a use the frictional force Ff = µFN. You’ll have to decide which µ works better.
For the box on the slope: amazingly you can do it even though you don’t know the mass of the box. The mass will cancel out everywhere. Start with ma = Fnet = Fparallel-Ff. (FN = Fperp.) If you substitute in correctly, you can get mass to cancel.
Sorry about the lack of subscripts and superscripts here. Did you see the extra credit assignment.
For the box on the slope: amazingly you can do it even though you don’t know the mass of the box. The mass will cancel out everywhere. Start with ma = Fnet = Fparallel-Ff. (FN = Fperp.) If you substitute in correctly, you can get mass to cancel.
Sorry about the lack of subscripts and superscripts here. Did you see the extra credit assignment.
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