The coefficient of static friction between the 200-kg crate and the flat bed of the truck is ms = 0.3. Determine the shortest time for the truck to reach a speed of 60 km>h, starting from rest with constant acceleration, so that the crate does not slip.

LECTURE 10 Moment about an axis Moment of a scalar force about any point is to the shortest perpendicular distance To find the moment around an axis (a) We take the dot product of the unit vector of a with (r x F), the cross product of r and F For example, you should set up a problem like so… uax uay uaz rx ry rz Fx Fy Fz ua is the unit vector along the a axis r is the position vector from the a axis to where the force is applied F is the force applied Note: (P x Q) ∙ R = R ∙ (P x Q) LECTURE 11 MOMENT OF A COUPLE A couple is 2 parallel forces with the same magnitude pointing in opposite directions Moment by a couple is defined as Mo = Fd F is the magnitude of the force and d is the perpendicular distance between the