Darrius and Monte decided to enter the annual Strong Man Competition. One of the categories they will have to compete in is the Truck Pull, in which they will have to strap a harness on themselves, attach it to a truck, and pull the truck by using the sheer force of their bodies moving forward. Since they are only in the training phase, they decide to each start by pulling a small car, but no matter how hard they try, the car will not move. What type of friction does this scenario illustrate?