KIN 3514 Objective Questions for Final

KIN 3514 Objective Questions for Final - Biomechanics...

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Biomechanics Objective Questions for Final - 1 Chapter Eight – Linear Kinematics 1.) Describe how kinematic data are collected. a. Kinematics: translational motion: straight line; ex: parachutist b. Simply observing a movement in qualitative c. Data acquisition for quantitative analysis: i. Accelerometers: measure acceleration directly ii. Photographs: static analysis iii. High speed video or opoelectric systems: report position of body segments with respect to time; markers on the body are tracked, the cameras are calibrated with a reference frame 1. Reference systems a. Rectangular reference system: oriented in any manner (not always vertically and horizontally); may be fixed on a segment i. 2D (X and Y): Two axes ii. 3D (X,Y, and Z): Three axes 2. Units of measurement a. In biomechanics the metric system is used; based on SI i. Kilogram (mass) ii. Meter (length) iii. Second (time) iv. Degrees Kelvin (temperature) 2.) Distinguish between Vectors and Scalars a. Scalars can be described by magnitude i. Mass, distance, speed, volume, temp b. Vectors have both magnitude and direction i. Velocity, force, acceleration, displacement
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Biomechanics Objective Questions for Final - 2 ii. Represented by arrows iii. When they undergo displacement the distance and direction are important iv. Can be added together at head to tail 3.) Discuss the relationship among kinematic parameters of position, displacement, velocity, and acceleration a. The position of an object refers to its location in space relative to a reference system i. Velocity is a measure of the slope of the position-time curve. b. Displacement defines change in position; is a straight line between start and finish; vector i. Distance is a scalar not to be confused with displacement c. Velocity is a vector; velocity=change in displacement/change in time; the most common unit of velocity is (m/s) i. The point where velocity is maximum in a velocity-time graph indicates the point where acceleration is 0 ii. The steepness of the slope of the velocity-time curve is an indication of the magnitude of the acceleration iii. Speed is a scalar; speed= change in distance/change in time d. Acceleration is a vector; Acceleration=change in velocity/change in time; the most common unit of acceleration is (m/s 2 ) i. Positive acceleration relates to the direction of motion away from the origin and increasing velocity; it also relates to the direction of motion towards the origin and decreasing velocity 4.) Distinguish between average and instantaneous quantities a. Instantaneous velocity: velocity at a particular instant; smaller change in time i. Slope of a line tangent to the position-time curve b. Instantaneous acceleration: acceleration at a particular instant; smaller change in time i. Slope of the line tangent to a velocity-time graph
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Biomechanics Objective Questions for Final - 3 5.) Conduct a numerical calculation of acceleration and velocity using the first central distance method a. V xi =X i+1 – X
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This note was uploaded on 12/12/2010 for the course KIN 3514 taught by Professor Lili during the Fall '09 term at LSU.

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KIN 3514 Objective Questions for Final - Biomechanics...

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