Answer to Question #274237 in Physics for Junard

Question

A chair of mass 12 kg is sitting on the horizontal floor, the floor is not frictionless. You push the chair with a force F=40N that is directed to an angle of 37° below the horizontal, and the chair slides along the floor. a.Draw a clearly labeled-body diagram for the chair. b.Use your diagram and Newton's law to calculate the normal force that the floor exerts on the chair

Answer 1

a.

b. The normal force:

$$N=mg+F\sin\theta=142\text{ N}.$$