A car is driven on a large revolving platform which rotates with constant angular speed w.At t=0, a driver leaves the origin and follows a line painted radially outward on the platformwith a constant speed v0.The total weight of the car is W,and the co-eff. of friction between the car and the stage is mu. 1.Find the acceleration of the car at t>0 using polar co-ordinates. 2.Find the time in whih the car just starts to slide. Find the direction of friction force w.r.t. the instantaneous position vector R just before the car starts to skid. It's a big difficult problem.I followede that the path will be a spiral startig from the origin.But, cannot confidently draw the free body diagram including the polar co-ordinates.So, I could not get the equation.