Question

5.4.2 test (cst): computer - scored unit test
frank gives a box of books a push to the right, which makes it slide across his bedrom floor. friction slows the box down as it slides. which free - body diagram shows the box as it is sliding to the right, after frank has stopped pushing it?
a. a
b. b
c. c
d. d

Explanation:

When the box is sliding to the right on the bed - sheet after Frank has stopped pushing, the force of gravity ($w$) acts downwards, the normal force ($F_N$) acts upwards perpendicular to the surface of the bed - sheet, and the frictional force acts in the opposite direction of the motion of the box (to the left). In free - body diagram C, the weight ($w$) is downwards, the normal force ($F_N$) is upwards, and the frictional force is to the left which is consistent with the motion of the box.

Answer:

C. C