Explain why sportsmen use shoes with spikes?
The spikes in shoes increase the interlocking between the shoes and rough surface of the ground increasing the friction between the two surfaces. This decreases the chances of slipping at the surface to a great extent and increases the grip between the shoes and the ground. Fast movement becomes easier as the grip increases. Therefore sportsmen use shoes with spikes.
Below is a diagram of a sportsperson along with the forces acting on him:
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