A Crate is Dragged A 66kg crate is dragged across a floor by pulling on a rope a

Question

A Crate is Dragged A 66kg crate is dragged across a floor by pulling on a rope attached tothe crate and inclined 15° above the horizontal. (a) If the coefficient of static friction is0.48, what minimum force magnitude isrequired from the rope to start the crate moving?

(b) If µkin = 0.33, whatis the magnitude of the initial acceleration of thecrate?
I am not sure how you solve it with ainclined rope (a) If the coefficient of static friction is0.48, what minimum force magnitude isrequired from the rope to start the crate moving?

(b) If µkin = 0.33, whatis the magnitude of the initial acceleration of thecrate?
I am not sure how you solve it with ainclined rope

Explanation / Answer

Fx = F cos = s mg   where F is the tension in the rope F = s m g / cos After the crate is moving the net force is Fx- k m g = m a = m g (s -k) and a = g (s - k) = .15 g =1.47 m / s2

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