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Friction in Sports

Examples of Friction

It’s all about friction. Friction from the snow, friction from the air, friction from the surface of the ski or the clothing you wear. The physics of skiing is all about how to overcome drag and resistance and allow a skier to slice his/her way down the mountain. And if Newton’s laws have anything to do with it, a skier who controls friction best has the best chance of winning.

Relationship of Mu

Direction of Friction

~Rolling friction- When a soccer ball rolls.

~Sliding Friction- When an ice skater is skating.

~Air Friction- A sky diver falling out of the air is affected by air friction.

~Fluid Friction-When a swimmer swims the water and the swimmer's body rub together.

~Static Friction- When you hit a tennis ball the friction applied is static.

Friction

The coefficient of friction does depend on it's surface type due to the amount of friction that will be present at that surface. For an example in curling the sport would not work if it was played on grass or gravel, but mass does not matter. Mass is not weight and the normal force is the weight of the object. Weight is the measurement of the gravitational force and mass is how much matter is in a object. If you had an object with the same mass rolling on different surfaces with the same force the rougher surface would have a different Mu.

1. surface resistance to relative motion, as of a body sliding or rolling.

2. the rubbing of the surface of one body against that of another.

The force of the player had to overcome the friction to conclude the ball to move.

Coefficient of Friction

The player was kicking to the right and the friction was opposing on it's opposite direction .

A coefficient of friction is a value that shows the relationship between the force of friction between two objects and the normal force between the objects.

Mu = force of friction / normal force

On concrete the basketball player applied a force of 1.5 N and the weight of his shoe is 5.0 N.

1.5 / 5.0 = 0.30

The normal force is equal to the gravitational force since the forces are balanced and so the weight would also be the normal force. Also the force of friction is equaled to the applied force because they are balanced.

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