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Biomechanics Midterm Review

# Biomechanics Midterm Review - Biomechanics Midterm Review...

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Biomechanics Midterm Review By: Michael Hartman Biomechanics the application of mechanics to the understanding of biological systems Statics – systems in equilibrium (at rest or constant velocity) Dynamics – systems under acceleration Kinematics – study of motion Kinetics – study of forces which tend to cause or change motion Kinematics: Study of motion Motion: Change in position Motion occurs in space and time. Linear motion (translation) All points on a body move the same direction and distance at the same time. Rectilinear: all points on an object move in a straight line. Curvilinear: points on an object move through a curved path. Angular (rotary) motion All points on a body move through a circular patharound a fixed axis ( axis of rotation ). General motion Combination of linear and angular motion 7 Ways to Describe Motion 1. Position 2. Displacement 3. Distance 4. Velocity

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5. Speed 6. Acceleration 7. Projectile motion Displacement: straight line distance between the initial and final positions. Displacement = final position – initial position Average Velocity = Change in position Time taken Acceleration is: Speeding up (increase in magnitude of velocity) Slowing down (decrease in magnitude of velocity) Changing direction (in any direction) Vertical Motion Only force acting on projectile is gravity acting directly downwards toward the ground (neglecting fluid force) Force of gravity causes a constant negative acceleration: a = g = -9.81 m/s 2 Horizontal Motion No force acts horizontally on projectile (neglecting fluid force) Projectile does NOT accelerate horizontally a = 0 m/s 2
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