Biomechanics 5.0 / 5 based on 6 ratings ? Physical EducationBiomechanicsASOCR Created by: Lydia HowdonCreated on: 12-05-17 13:22 Law 1 Inertia - resistance of a body to a change in state of motion 1 of 31 Law 2 Acceleration - rate of change is proportional to the size of force applied 2 of 31 Law 3 Reaction - every action applied to a body has an equal/opposite reaction force 3 of 31 Velocity (m/s) calculation Displacement (m) ÷ time taken (s) 4 of 31 Momentum (kgm/s) calculation mass (kg) x velocity (m/s) 5 of 31 Acceleration (m/s/s) calculation (final velocity - initial velocity (m/s)) ÷ time taken (s) 6 of 31 Force (N) calculation Mass (kg) x acceleration (m/s/s) 7 of 31 Net Force definition Sum of all acting forces on the body 8 of 31 Effects of force Create motion, accelerate a body, deccelerate a body, change direction of a body, change shape of a body 9 of 31 Vertical forces Weight (gravity), reation 10 of 31 Horizontal forces Friction, air resistance 11 of 31 Factors affecting friction Roughness ground surface, roughness contact surface, temperature, size of normal reaction 12 of 31 Factors affecting air resistance velocity, shape, frontal cross-sectional area, smoothness of surface 13 of 31 Balanced forces NET = 0 , W=R , AR=F 14 of 31 Unbalanced forces WAR 15 of 31 Limb kinematics 3D, converts motion , uses optical motion analysis, for joint/limb efficiency 16 of 31 Limb Kinematics advantages Highly accurate, improve performance, prep/excecution/follow through can be evaluated 17 of 31 Limb Kinematics disadvantages Highly specialised, not for individual differences, accuracy depends on marker placement 18 of 31 Force Plates Gait analysis, force tranduces, electrical output appears graphically, 3 planes of motion 19 of 31 Force Plate advantages Immediate, accurate, reliable results 20 of 31 Force Plate disadvantages specialist, expensive, labartory conditions, may change way athlete jump/run 21 of 31 Wind Tunnels Develop drag reduction, decrease AR, aerodynamic efficiency, tight control environmental variables 22 of 31 Wind Tunnel advantages Precise, accurate, reliable results, time efficient 23 of 31 Wind Tunnel disadvantages specialised facillities, expensive, complex analysis done by proffessional 24 of 31 Centre Of Mass Definition Point the body is balanced in all directions and weight appears to act 25 of 31 Centre Of Mass Not a fixed point, differetn positions change COM point 26 of 31 Stability Definition Ability of body to resist motion and remain at rest 27 of 31 Factors affecting stability Mass, Height, Base of support, Line of gravity 28 of 31 Lever Systems Functions Generate muscular effort, increase speed movement given 29 of 31 Lever Systems lever=bone, fulcrum=joint, effort=muscle force, load=weight/resistance 30 of 31 Efficiency Lever Systems distance F to E = effort arm, distance L to F = load arm 31 of 31
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