Kinesiology 2241A/B Lecture Notes - Lecture 8: Centripetal Force, Friction, Centrifugal Force
13 Oct 2018
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Newton(cid:859)s 3rd law: if a force is applied to an object, that object pushes back with the same force. This pair of forces is the: action force and reaction force, reaction: acts on foot, action: acts on ball. They are equal in magnitude and opposite in direction. Examples of reactions: reaction force that acts back on the body is what causes injury or makes you move rely on environment to give us the reaction forces we are expecting to move or get somewhere. Reaction forces = external forces: means that they originate in our external environment and act on the body. Action forces = internal forces: arise from muscular contractions applying force to skeleton and causing limbs to move. Internal and external forces are related by newton(cid:859)s 3rd law but need something to push against it. When don(cid:859)t have so(cid:373)ethi(cid:374)g to push against, you can(cid:859)t accelerate your centre of mass (swimming)
