1. The problem statement, all variables and given/known data I have attached the known information. When the truck is at rest, will the crate also be at rest or will it slide downwards? 2. Relevant equations Sum F_y =0 G_max = (my_s)*N G_min = (my_k) * N 3. The attempt at a solution I did a Free body diagram on the crate (see the attached file) The first step is finding the normal force. Sum F_y =m*a_y =0 N-mg*cos(10)=1932.19 N now i find the friction forces G_ max=(my_s)*N= 0.70*1932.19=1352.53 N G_min=(my_k)*N=0.50*1932.19=966.10 N Now i will find F_II F_II = m*g*sin(10) = 340.70 N since G_max > F_II there is no motion downwards i,e a_x = 0 I am not sure if I have done it correct. Thank you for your help.