Homework Help: physics

Posted by megan on Tuesday, January 18, 2011 at 4:34am.

A 3.20 kg block is pushed along the ceiling with a constant applied force of 85.0 N that acts at an angle of 55.0° with the horizontal.

The block accelerates to the right at 7.50 m/s2.

Determine the coefficient of kinetic friction between block and ceiling.

Would appreciate some guidance on how the Normal force works in this case

physics - Henry, Wednesday, January 19, 2011 at 7:52pm
Fb = 3.2kg * 9.8 = 31.36N = ver(normal)
force of block.

Fh = 85*cos55 = 48.75N.

Fv = 31.36 + 85*sin55 = 101N = ver. force.

Fn = Fh - uFv = ma,
48.75 - 101u = 3.2 * 7.5 = 24,
48.75 -101u = 24,
-101u = 24 - 48.75,
-101u = -24.75,
u = -24.75 / -101 = 0.245 = coefficient
of friction.

NOTE: Fn = Net force.

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