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Unformatted text preview: CHAPTER 8 True or False 1. ____Calculating the range of motion at the hip joint during stair ascent after visually observing the movement is a quantitative analysis. T 2. ____The motion of a parachutist in the air is an example of translational motion. T 3. ____The x and y axes in a twodimensional rectangular reference system are always oriented vertically and horizontally, respectively. F 4. ____With a coordinate reference system originating at the hip joint, the axes of the coordinate system will always be horizontal and vertical. F 5. ____A 3D reference frame has three axes. T 6. ____Speed is a scalar quantity. T 7. ____Acceleration is defined as the time rate of change of position. F 8. ____Displacement is a scalar quantity. F 9. ____The slope of a line tangent to a curve indicates instantaneous velocity. T 10. ____Vectors can be added together graphically by placing the head of one vector at the tail of the other vector. T 11. ____The area under a displacementtime graph represents the average velocity. F 12. ____Positive acceleration always relates to the direction of motion away from the origin. F 13. ____The point where the velocity is maximum in a velocitytime graph indicates the point where acceleration is maximum. F 14. ____Velocity is a measure of the area under the positiontime curve. F 15. ____The steepness of the slope of a velocitytime curve is an indication of the magnitude of the acceleration. T 16. ____Stride length is measured from the heel contact of one foot to the heel contact of the other foot F 17. ____The support phase in walking accounts for the same percentage of the total cycle as running. F 18. ____Walking speed is increased by first increasing stride length and then stride rate. F 19. ____Successful sprinters can usually increase their acceleration at the end of the race. F 20. ____During running, stride length can affect metabolic cost. T 21. ____In a golf swing, the club head should be decelerating past contact with the ball. T 22. ____Maximum acceleration of the club head occurs at the moment of impact in a golf swing. F 23. ____Velocity of wheelchair propulsion is increased by increasing the length of the push on the wheel. F 24. ____Horizontal motion of a projectile is a special case of constant acceleration and determines, among other factors, the range of the projectile. T 25. ____Vertical velocity of a projectile is affected by gravity. T 26. ____Projectiles are never affected by air resistance. F 1. Convert the rectangular coordinates of (122,10) to polar coordinates. B a. (11.49, 4.69) b. (122.4, 4.69) c. (122.3, 85.3) d. (11.49, 85.3) 2. Convert the polar coordinates of (135, 182) to rectangular coordinates. C a. (4.71, 134.9) b. (134.9, 4.71) c. (134.9, 4.71) d. (4.71, 134.9) 3. Figure 811 depicts the path of a runner. If the runner starts and ends at the end of each block, and if each block is a square with lengths of 200 meters, what is the magnitude of the resultant displacement of the runner? C a. 1200m b. 1150mb....
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 Fall '09
 LiLi

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