1. The problem statement, all variables and given/known data A 2kg sled slides down a curved path where it's velocity at the point directly at the bottom of the hill it has speed 4m/s. If the radius of curvature at the point at the bottom of the hill is 1.5 meters, determine the normal force exerted on the sled at that point. Is the knowledge of friction properties neccessary? 3. The attempt at a solution Initially I am unsure if the knowledge of friction is absolutely neccesary to solve this problem. I think that the first step is to break the sled up at the bottom of the hill into normal and tangential coordinates. The normal acceleration is v^2/r, I'm not sure if this is the first step or not. Guess I need a clue how to start this problem, and whether or not knowledge of friction is absolutely neccessary. TIA!