Homework Help: physics

Posted by ashlee on Sunday, January 20, 2013 at 8:42am.

A 5-kg crate is resting on a horizontal plank. The coeﬃ-
cient of static friction is 0.5 and the coeﬃcient of kinetic
friction is 0.4. After one end of the plank is raised so
the plank makes an angle of 25
with the horizontal, the
force of friction is?

physics - Henry, Monday, January 21, 2013 at 10:22pm
Wc = m*g = 5kg * 9.8N/kg = 49 N, = Wt.
of crate.

Fp = 49*sin25 = 20.3 = Force parallel to
ramp.
Fv = 49*cos25 = 44.4 N. = Force perpendicular to ramp.

Fs = u*Fv = 0.5*44.4 = 22,2 N. = Force
of static friction.

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