A child sits on a sled (70kg) on a snowy hill with an incline of 15 degrees. A downward force of 425N called Fa is applied by a parent, parallel to the normal force, to prevent the child from sliding down the hill. What is the coefficient of static friction? Answer: 0.16

a) What object are you summing forces on?

b) What forces are acting on that object and in what direction

c) Draw a free body diagram.

d) Write an equation to sum the forces acting on the object in the x direction

e) Write an equation to sum the forces acting on the object in the y direction.

e) Solve for the unknowns.