The moving sled decelerates because of the kinetic frictional force. Three forces act on the moving sled, the weight W→ of the sled and its rider, the normal force F→N, and the kinetic frictional force f→k. The free-body diagram for the sled shows these forces.

Figure 4.24

(a)

The moving sled decelerates because of the kinetic frictional force.

(b)

Three forces act on the moving sled, the weight of the sled and its rider, the normal force , and the kinetic frictional force . The free-body diagram for the sled shows these forces.