Instructions: Answer the questions regarding the coefficient of friction.
9. What would be the normal weight of a chair if the coefficient of friction between it and the floor is 0.38 and the force needed to push it is 88 lbs.?

10. In an attic, an old trunk with a weight of 500 newtons is found. The force needed to push the trunk is 276 newtons. Find the coefficient of friction.

+11. A small block of wood has a normal weight of 50 lbs. If the coefficient of friction between the wood and the floor is 0.73, how much force must be exerted to push the block?