Experimental Study on Friction of Different Soles Patterns of Tennis Shoes and Marathon Shoes

In order to simulate the human body motion at the exercise time(simulating variable speed),the simulated exercise was done with the variable load between the marathon shoes and tennis shoes for the selection of sport shoes in the training to prevent the joints,tendon,ligament from being damaged and to provide a theoretical support.The friction on the analog plastic ground is much bigger than that on the analog wood ground.And on the wooden floor,the friction of line patterns is bigger while the friction of crossed patterns is smaller;on the plastic ground,the friction of line patterns is bigger while the friction of point patterns is smaller.The largest ground-based static friction and dynamic friction on the wooden planks with the thickness of fore soles have a negative correlation,while the largest ground-based static friction and the dynamic friction,the friction with the changing speed instantly,and the friction after changing speed with the thickness of the aft soles on the plastic planks,have negative correlation as well.The friction at the different surface between marathon shoes and tennis shoes has little difference,while both the friction with the changing speed instantly and the friction after changing speed of the tennis shoes on the plastic ground are bigger than that of the marathon shoes.Because of the big friction of the soles,we slipping can be avoid,take-off and brake effectively,while if there is too much friction,the flexibility of the foot will be affected,resulting in fatigue and sports injuries,thus the friction should be controlled in a suitable range.