An adult is pulling two small children in sleigh over level snow. The sleigh and the children have a total mass of 47 kg. The sleigh rope makes an angle of 23 with the horizontal, The coefficient of kinetic friction between the sleigh and the snow is 0.11. Calculate the magnitude of the tension in the rope needed to keep the sleigh moving at constant speed. The book gives me a hint saying that the normal force is not equal in magnitude of the gravity. I don't get why they are not equal...because the sleigh is still on a leveled surface... so why is not same as Fg? And how do i figure out the normal force?