KINES 300 Lecture Notes - Lecture 3: Anatomical Terms Of Motion, Mechanical Advantage, Anatomical Terms Of Location

• School: American River College
• Department: Kinesiology
• Course: KINES 300
• Professor: Kiefer

Document Summary

To make a segment move about the joint, we need both force and moment arm. Torque is the angular term for force. Moment arm = the perpendicular distance from the axis of rotation to the force vector. You might need to extend the force vector. When force penetrates the axis of rotation, there is no moment arm no. Application point = distal attachment of muscle. If net torque is negative (downwards), the exercise would be too difficult for the client. Check the velocity to know if something is moving. Transfer of momentum: momentum can transfer from one object to another. When you move the femur, the pelvis moves. When you move the arm, the shoulder moves. This is why stabilization of joints is so important. To stop momentum of an object, you need to apply a force to the object over a period of time. In other words, you need to generate impulse. Mass*acceleration*time = force * time = impulse.