Friction
Friction makes you slow down when you run because there is heat. Friction helps the player run but it also slows the player down. When a player is running with cleats on it is rolling friction because it is pointed. when a football is in the air it is fluid friction because there are gasses in the air. When a quarterback is sliding for the first down it is sliding friction. When a defensive lineman is trying to get through the offense line it is static friction. When you tackle someone in football and you go sliding down against the ground friction is what slows you down so you don't keep going and never stops according to newtons first law. A force is a push or a pull upon an object that results from its interaction with another object. A heavier is harder to stop when running, harder to move then when its a smaller player. The force that acts to resist the relitive motion (or attempt) of objects or materials that are in contact. Friction is a force that opposes motion, or makes it difficult for an object to move across a surface. The amount of friction depends on the surface type and the force pressing two surfaces together.Everyday life provides examples of how friction both helps and hinders everything we do. When you tackle somebody in football and you go sliding against the ground friction is why slows you down so you don't keep going and never stop. When the quarterback throw a pass, theres friction between his fingertips and the ball, helping to impart spin to the football in the air. Runners need a good grip between their shoes and the surface of the playing field, and other than gravity, friction provides the good footing the need. There is a small amount of friction between opposing players during blocking.
Review Questions
1)Which term means "resistance to motion"?
a. pressure
b. inertia
c. friction
d. momentum
e. reference point
2) When blocking in football. Why does a defending lineman often attempt to get his body under that of his opponent and push upward? What effect does this have on the friction force between the opposing lineman's feet and the ground.
a. pressure
b. inertia
c. friction
d. momentum
e. reference point
2) When blocking in football. Why does a defending lineman often attempt to get his body under that of his opponent and push upward? What effect does this have on the friction force between the opposing lineman's feet and the ground.