Kinesiology 2241A/B Lecture Notes - Lecture 10: Friction, Linoleum, Kinetic Energy

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If a force is applied to an object, that object pushes back with same force. This is pair of forces are the action force and the reaction force. They are equal in magnitude and opposite in direction. What makes you go is reaction force that you feel. Eg. person with hands on rings, what torque and force you need tp stand the reaction force. It"s the reaction force that when we examine our linked rigid body system. Muscles react against the force coming from external force. What against it is internally is bones etc. The reaction forces that we have been talking about are external forces. This means that they originate in our external environment and act on the body. The action forces that we have been talking about are internal forces. These arise from our muscular contractions applying force to our skeleton and causing the limbs to move. You need those external forces to be able to move.

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