sonal gupta 
Football players have to run fast and change directions quickly. Slipping on grass or turf can hurt their groin and hip flexors.
To prevent this, shoes have studs under the soles to give players more traction on the ground. They’re also called cleats. These nails increase the surface area of the shoe and create more frictional force.
Friction
The nails present in the shoes of the players increase the frictional force. This is because the nails have a rough surface which causes the frictional force to be greater than the normal frictional force.
This helps the players to have more grip on the ground and avoids slipping. They can also change their direction quickly by using this feature of the shoes. It is a necessary feature for players because football is played on different surfaces, including natural grass and artificial turf. Also, the game can be played in wet or muddy conditions. So, the use of spikes in the shoes help the players to have more traction on the ground.
Friction is a phenomenon that prevents objects in contact from moving relative to each other. It arises from the microscopic deformations of the contact surfaces, absorbing and dissipating energy. Friction is important for many everyday activities, such as walking on the road or fixing a nail in the wall. It is also important for a wide variety of physical phenomena, such as mechanical wear-resistance and fluid lubrication. This is why it is important to understand how friction works.
Style
Basketball players like the Dallas Mavericks’ DeAndre Jordan, Lakers’ Kyle Kuzma, and Lance Stephenson have been spotted wearing spiked sneakers. NBA superstar and sneaker champ P.J. Tucker has been toting them around, too.
The studs or spikes on the shoes help the players to grab onto the grass ground, prevent them from slipping and running fast, and also allow them to change direction easily. These are essential features that help players to play effectively on a variety of different surfaces and in different weather conditions.
The studs are usually hand-cut tack nails, which have a flat head and sharp point. They are affixed to the shoes to give them a distinct look and provide additional traction and safety.
