1. Ancilla applies a force of 200 N [E] horizontally to pull a 38 kg sled across the snow at a constant velocity for 200 m. (a) Draw a FBD of the sled (b) What is the magnitude of the force of friction on the sled? (c) What is the magnitude of the force of gravity on the sled? (d) What is the magnitude of the normal force on the sled? (e) What is the coefficient of kinetic friction between the sled and the snow? (f) How much work did Ancilla do on the sled? 2.A skier (mass = 65 kg) is at rest at the top of a 75 m hill. She pushes off and when she reaches the bottom of the hill she has a speed of 25 m/s. (a) What type of energy transformation has taken place? (b)Findtheefficiencyoftheenergytransformation. (c) What happened to the energy that was lost?

3.Skateboarder Toby (mass 103 kg) starts his descent from the top of a 6.0 m half-pipe which has negligible friction. (a) What is Toby's gravitational potential energy at his maximum height? (b) What is Toby's gravitational potential energy at a height of 3.5 m? (c) As Toby descends the pipe, what energy transformation occurs? (d) What is Toby's speed at the height of 3.5 m?