Homework Help: physics

Posted by Melissa on Tuesday, April 10, 2012 at 5:05pm.

A 12 kg toboggan is pulled along at a constant velocity on a horizontal surface by a horizontal force of 11 N

How much horizontal force is needed to pull the toboggan at a constant velocity if two 57 kg girls are sitting in it ?

physics - Elena, Tuesday, April 10, 2012 at 5:17pm
The projections of the equation of motion are
x: F – F(fr) = 0
y: N - m• g = 0

F = F(fr) = K• N= k• m• g.
k = F/m• g = 11/(12•9.8) = 0.093.

The projections of the equation of motion in the second case are
x: F1 – F1(fr) = 0
y: N - M• g = 0
F1 = F1(fr) = k• N1 =k• M• g = 0.093• (2•57+)•9.8 = 114.8 N

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