Biomechanics 1.0 / 5 based on 1 rating ? Physical EducationBiomechanicsA2/A-levelOCR Created by: jodielynch4Created on: 22-05-17 21:44 1st Law of Motion A body stays in a state unless acted upon by an external force 1 of 19 2nd Law of Motion When a force acts on an object the rate of change of momentum is proportional to the size of the force 2 of 19 3rd Law of Motion For every action applied to a body there is an equal and opposite reaction 3 of 19 Net Force The overall force that acts on a body when two or more forces have been considered 4 of 19 Weight Gravitational force that earth exerts on a body pulling it to the ground 5 of 19 Reaction Force acting whenever two bodies are in contact 6 of 19 Friction Force acts in opposition to the movement of one surface over another 7 of 19 Air Resistance Force acting on a body travelling through air opposite to the direction of travel 8 of 19 Force A push or pull that alters the state of motion of the body (mass x acceleration) 9 of 19 Momentum Quantity of motion possessed by a body (mass x velocity) 10 of 19 Acceleration The rate of change of velocity (change in velocity/time taken) 11 of 19 Centre of Mass The point at which a body is balanced in all directions 12 of 19 Principles of Stability Lower centre of mass, wider base of support, more points of contact, closer the line of gravity to the centre of base of support 13 of 19 1st Class Lever Fulcrum (joint) in the middle 14 of 19 2nd Class Lever Load (resistance) in the middle 15 of 19 3rd Class Lever Effort (muscle) in the middle 16 of 19 Limb Kinematics The study of movement in relation of time & space, joint movement & efficiency is analysed, weaknesses identified, e.g. football shot 17 of 19 Force Plates Measures ground reaction forces, assess size & direction of force, improves technique, e.g. swimmer 18 of 19 Wind Tunnels Large chamber with giant motor driven blades to stimulate air flow like real conditions, reduces air resistance, e.g. F1 drivers 19 of 19
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