The crate has a mass of 50 kg and the coefficient of static friction between the crate and the plane is µs =0.25.

(a)determine the minimum horizontal force p required to hold the crate from sliding down the plane.
(b) determine the minimum force p required to push the crate up the plane

Explanation:

Given

mass of crate

Coefficient of  static Friction

Let be angle of inclination

resolving Forces along and perpendicular to plane

Force along Plane

----------1

Forces perpendicular to plane

Substitute the value of

(b)Minimum Force require to push the crate up the Plane

i.e. Force Must act parallel to plane

Forces Along the Plane

-------2

Forces Perpendicular to plane

Substitute in Equation 2

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