# Biomechanics

• BiomechanicalPrinciples
• Newton's Law Of Motion
• Newton's Second Law Of Motion- Law Of Acceleration
• "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."
• Newton's First Law Of Motion- Law Of Inertia
• "A body continues in a state of rest or uniform velocity unless acted upon by an external or unbalanced force."
• Newton's Third Law Of Motion- Law Of Reaction
• "For every action force applied to a body there is an equal and opposite reaction force."
• Calculations
• Acceleration
• Acceleration = (Final Velocity - Initial Velocity) / Time Taken
• Momentum
• Momentum = Mass x Velocity
• Force
• Force = Mass x Acceleration
• Velocity
• Velocity = Displacement / Time Taken
• Force
• Net Force: the sum of all forces acting on a body.
• Effects of Force
• Decelerate a Body
• Accelerate a Body
• Change Direction Of A Body
• Create Motion
• Change Shape Of A Body
• Vertical Forces
• Weight
• Reaction
• Horizontal Forces
• Air Resistance
• Factors affecting AR: velocity, shape, frontal cross-sectional area, smoothness of surface
• Friction
• Factors affecting friction: Roughness ground surface, roughness contact surface, temperature, size of normal reaction
• Balanced Force
• NET = 0 , Weight=Reaction , Air Resistance=Force
• Unbalanced Force
• NET is greater than 0
• Analysis through the use of technology
• Limb Kinetics
• 3D, converts motion , uses optical motion analysis, for joint/limb efficiency
• Highly accurate, improve performance, prep/excecution/follow through can be evaluated
• Highly specialised, not for individual differences, accuracy depends on marker placement
• Wind Tunnels
• Develop drag reduction, decrease AR, aerodynamic efficiency, tight control environmental variables
• specialised facillities, expensive, complex analysis done by proffessional
• Precise, accurate, reliable results, time efficient
• Force Plates
• Gait analysis, force tranduces, electrical output appears graphically, 3 planes of motion
• specialist, expensive, laboratory conditions, may change way athlete jump/run
• Immediate, accurate, reliable resultsImmediate, accurate, reliable results