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## Lecture 1 Notes

by: Jennifer Nguyen

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# Lecture 1 Notes HLTH 4302

Jennifer Nguyen
UHCL

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These notes are going to be on our first exam.
COURSE
Biomechanics
PROF.
John Dewitt
TYPE
Class Notes
PAGES
2
WORDS
CONCEPTS
Force, Biomechanics, kinematics, kinetics
KARMA
25 ?

## Popular in Health Sport And Exercise Science

This 2 page Class Notes was uploaded by Jennifer Nguyen on Wednesday August 31, 2016. The Class Notes belongs to HLTH 4302 at University of Houston Clear Lake taught by John Dewitt in Fall 2016. Since its upload, it has received 9 views. For similar materials see Biomechanics in Health Sport And Exercise Science at University of Houston Clear Lake.

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Date Created: 08/31/16
Biomechanics 4302 – Fall, 2015 Note sheet – Lecture 1 Introduction ● Biomechanics is defined as the study of forces and movement on living systems. ● The study of time, space, and position of an object is called kinematics. ● The study of the force, moment, and energy associated with an object is called kinetics. ● Common variables associated with kinematics include speed, position, velocity, general motion, and acceleration. ● Common variables associated with kinetics include torque, force, and energy. ● Three basic dimensions that we measure in biomechanics are length, time, and mass/inertia. ● Mass is different than weight because of the unit of measurement (kg vs lb.) and weight takes gravity (which is really acceleration) into account. Mass is a measure of inertia, a property of an object, which stays constant. Inertia is how much an object will resist movement. Weight is a force and is not constant. ● Although these dimensions can be measured in the English System, the system of measurement necessary for many formulas is the metric system. ● Conversion from one unit to another is completed with a scaling factor. Chapter 1 – Forces ● A force is defined as a push or a pull. ● A force applied to an object causes something to change speed (velocity). ● The unit for force is newton (N). ● Force is a vector because it has a direction and a magnitude ● There are two types of forces: o Internal: can come from muscles, bones on bones, tendons/ligaments. o External: can come from the environment, friction, and gravity. ● Gravity is defined as an acceleration (downward force) ● The gravitational constant is 9.81 m/s   2 ● Gravity’s units are m/s    , which makes it an acceleration ● Contact forces is the force between two forces that are touching each other. Also known as the reaction force. ● The definition of friction is a resistance that opposes motion. ● There are two types of friction o Static: an object is not moving over a surface o Dynamic: where one surface is moving relative to the other ● Friction (is / is not) affected by contact area ● The equation for static friction is Fs= μsR ● The equation for dynamic friction is  Fd= μdR ● Friction always opposes movement ● Forces with the same line of action are collinear forces. ● Forces acting through the same point are concurrent forces. ● A free body diagram displays all the forces acting on the object. ● The Pythagorean Theorem is a   + b   = c 2 ● SOH – CAH – TOA is sin(opp/adj) – cos(adj/hyp) – tan (opp/adj) ● Many forces acting on a point can be combined into a single force called a resultant force ● Non-collinear forces must be broken into their components before adding and subtracting ● Static equilibrium is where the sum of all the forces equal zero. (where you are not accelerating)

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