Problem 19.1 A horizontal force P acts on a cabinet that rests on a floor as shown. The cabinet weighs 120 lbf. It is known that the coefficient of static friction is µ = 0.30 and the coefficient of kinetic friction HK = 0.24. (a) If slipping impends, what is the magnitude of P? (b) If tipping impends, (i) what is the magnitude of P, and (ii) at what point will the resultant floor reaction act? (c) What is the smallest magnitude of P that will cause the cabinet to move? What type of motion will the movement be, i.e., "slip" or "tip"? P 36 inches B G C 24 inches 15 inches

Question 3(a) The non uniform XYZ bar which weighs 155 kg has its centre of gravity G at a distance 4 m from X. This bar rests on a homogeneous crate P. The static coefficient of friction between the bar and the crate is 0.31 while the same between the crate and the floor is 0.22. Determine the mass of the lightest crate P (in kilograms) that can be used to support this non uniform bar in the position shown in Figure 3. The height of the crate is 4.32 m and the length of the bar is 8.59 m. 4 m 3 m - 1 m - Figure 3 Question 3(b) Take an example from everyday life where you can identify the application of the concepts we learn in the "Dry friction" module. Sketch this example and discuss about the effect of friction on that particular scenario. Sketch does not have to be drawn to a scale. (Description should be 250 words or less).

A 250-lb block rests on a horizontal surface, as shown. The coefficient of static friction is 0.25. Calculate the maximum value of the horizontal force P so that neither sliding nor tipping will occur. 2'-0" W = 250 lb P. 4' 6" 3'-0"