ENS 303 Lecture Notes - Lecture 12: Vertebral Compression Fracture, Human Factors And Ergonomics, Fishing Rod

• School: SDSU
• Department: Exercise and Nutritional Sciences
• Course: ENS 303
• Professor: Margo Greicar

Document Summary

Biomechanics: mechanical principles that directly relate to the body. Force: any influence that causes an object to undergo a chemical change. Change caused by force can transpire in 3 ways: Change in movement: taut ct shows a stretch. Object"s resistance to a change in its state of motion or rest. Mass: quantity of matter in an object. Rotation of an object around an axis. Muscle line of pull = direction not force. Friction: need to get somewhere but may slow you down in the process. Force that resists the relative motion of two surfaces. Occurs inside and outside of the body. Mass stays the same but velocity changes (increases) Gravity: the force that attracts a body toward the center of the earth. Laws of movement: law of inertia, an object at rest tends to stay at rest, while an object in motion tends to stay in motion, to overcome inertia, you need force. Functions of levers: rom, moving against resistance.