1. The problem statement, all variables and given/known data Draw a free body diagram of the incline. Build the free body diagram of the man. Which is the force which makes the man to go up the incline? http://imagizer.imageshack.us/v2/800x600q90/46/t92m.png [Broken] 2. Relevant equations Newton's 2º Law 3. The attempt at a solution For the incline I've put a reaction from the floor, a reaction from the van, weight from the man and the box and the normal reaction from the incline to the weights of the man and the box. For the man I've put, the weight, the normal reaction from the incline to the weight, and the friction force going to the top of the incline. I suspect I am missing some force for the incline free body diagram, can you help me please?