A Level PE - Biomechanical principles and Stability
- Created by: hotzmc
- Created on: 24-12-17 12:31
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A Level PE - Biomechanic Principles & Stability:
Newton’s Law’s of Motion:
- A body continues in a state of rest or uniform velocity unless acted upon by an external or unbalanced force
- A body’s rate of change in momentum is proportional to the size of the force applied and acts in the same direction as the force applied
- For every action force applied to a body, there is an equal and opposite reaction force
- Understanding Newton’s laws of motion is important so that we can apply these laws during training to help improve performance
Newton’s First Law of Motion:
- A body continues in a state of rest or uniform velocity unless acted upon by an external or unbalanced force
- The law states that in order to change somethings state of motion (in this case it is still), the resistance acting on it must have a greater force
- The greater the mass the greater the inertia - the resistance of a body to change its state in motion
- So if a 100m sprinter doesn’t put enough force into the starting blocks at the start of the race, they will not move
Inertia: The resistance of a body to change its state of motion, whether at rest or while moving
Newton’s Second Law of Motion:
- A body’s rate of change in momentum is proportional to the size of the force applied and acts in the same direction as the force applied
- We understand that the greater the mass of a body, the greater the force needed to overcome the down gravitational pull and create motion
- The quantity of motion is called momentum, and it closely links to acceleration
- The rate of change in momentum & acceleration is proportional to the size of the force applied
- E.g. a 100m sprinter will want to generate as much forward force as possible to accelerate away from the blocks as fast as possible
Newton’s Third Law of Motion:
- For every action force applied to a body, there is an equal and opposite reaction force
- An action force is generated and applied by the athlete to the ground or an object
- A reaction force is the equal & opposite force generated by the ground/object back to the athlete
- It’s this force that will, for example, tell an athlete whether the pass they made was successful or not before they see the outcome
- E.g. When an 100m runner applies a down & back action force into the blocks, the blocks provide an equal & opposite up & forward reaction to the…
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