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59 Cards in this Set
- Front
- Back
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Using a force platform to measure the forces imposed on feet during walking is an example of what kind of analysis? |
Quantitative |
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During knee extension, the shank (segment between ankle and knee) undergoes what type of motion? Linear Curvilinear Angular Diagonal |
Angular |
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Which type of analysis is a nonnumeric evaluation of motion based on direct observation? Quantitative Qualitative Statics Dynamics |
Qualitative |
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Which phrase best defines biomechanics? The scientific study of human movement The science of the structure of the body The study of the structure and function of biological systems by means of the methods of mechanics The study of characteristics of motion from a spatial and temporal perspective without reference to the forces causing motion |
The study of the structure and function of biological systems by means of the methods of mechanics |
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The examination of the projectile characteristics of a high jumper is an example of which type of analysis? Angular Anatomical Kinetic Kinematic |
Kinematic |
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A _____ analysis would be used to determine the amount of force necessary to lift a 200 lb barbell in a squat. Kinetic Kinematic Static Dynamic |
Kinetic |
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Which is not part of the axial skeleton? Head Neck Upper extremities Trunk |
Upper extremities |
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The right and left deltoids are ______ to one another. Ventral Dorsal Ipsilateral Contralateral |
Contralateral |
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When the shoulders return to a neutral position from being shrugged, the scapulae undergo: Elevation Depression Protraction Retraction |
Depression |
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Holding the hand in a fixed position and drawing an imaginary O in the air with the thumb is best described as: Supination Pronation Inversion Circumduction |
Circumduction |
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A somersault occurs in which plane? Sagittal Frontal Transverse None of the above |
Sagittal |
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The magnitude of acceleration would be greatest for which of the following situations? Vi = 4 m/s Vf = 7 m/s dt = 2 s Vi = 4 m/s Vf = 6 m/s dt = 3 s Vi = 4 m/s Vf = 8 m/s dt = 1 s Vi = 40 m/s Vf = 43 m/s dt = 3 s |
Vi = 4 m/s Vf = 8 m/s dt = 1 (8 - 4)/1 = 4 |
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During the end of a 100 m race, a runner's acceleration is negative. What statement accurately interprets this observation? The runner is slowing down while moving in the positive direction The runner is speeding up while moving in the negative direction The slope of the velocity versus time plot is positive The runner is slowing down while moving in the negative direction |
The runner is slowing down while moving in the positive direction |
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While running a 100 m, a runner runs from the 20 to 30 m mark in 60 frames of a video record. If the camera recorded data at 50 fps, how fast was she running during this interval? 12.0 m/s 36 m/s 8.3 m/s 0.167 m/s |
8.3 m/s 10 m/60 frames = 0.16 m/frame 0.16 m/frame × 50 frames/sec = 8.3 m/s |
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If an object has a horizontal velocity (Vi) of 20 m/s and horizontal acceleration (a) of zero, what would be the horizontal velocity (Vf) after 4 s (t)? 5 m/s 20 m/s 80 m/s 59.2 m/s |
20 m/s Vf = Vi + a×t = 20 + 0×4 = 20 |
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During a 5 km race, a runner averaged 15 km per hour. What was her final time? 3 hrs 0.36 min 0.33 hrs 45 min |
0.33 hrs |
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Given the stick figure, which of the angles classifies as a distal end absolute angle? A B C D |
C |
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During a knee extension exercise, if angular velocity was a 5 deg/s, how long would it take to complete 40° of angular displacement? 8 s 9 s 10 s 11 s |
8 s |
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During a softball pitch, the pitcher's arm goes through 120° of angular displacement over 0.25 s. What is the average angular velocity? 480°/s 30°/s 120 m/s 360°/s |
480°/s |
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If the slope of angular velocity versus time plot is zero, then which of the following statements must always be true? Angular acceleration is negative Angular acceleration is positive The object is rotating counterclockwise Angular acceleration is zero |
Angular acceleration is zero |
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If the biceps brachii were contracting isometrically, what would be the angular acceleration about the elbow? Zero Positive Negative Constantly increasing |
Zero |
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What would be the angular speed of a diver who completed 2.5 revolutions (angular distance) in 1.25 s? 1.25 rev/s 2 rev/s 125 rev/s 0.5 rev/s 24 rev/s |
2 rev/s |
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For the plot, the angular acceleration vector would be positive in which region? A B C D |
C |
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If angular velocity (w) was 10°/s for 1.5 s (delta t), what would be the final angular position (theta final) if the initial angular position (theta initial) was 5°? 6.6° 11.6° 15° 20° |
W = (theta final - theta initial)/delta t Theta final = 20° |
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During an activity, if the initial angle (theta initial) of a segment was 180°, and the final angle was 100°, what was the angular displacement? 0° 80° -80° 280° -280° |
-80° |
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What would have been the initial angular velocity (wi) if angular acceleration (a) was 10°/s for 1.5 s (t) and final angular velocity (wf) was the 100 °/s? 75°/s 85°/s 95°/s 115°/s |
85°/s a = (wf - wi)/t |
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During the swing of a bat through an arc of 2 rad (114.6°), what would be the linear distance that the tip of the bat would have traveled if the radius of rotation was 1.5 m? 171.9 m 76.4 m 1.3 m 3 m |
3 m S = 1.5 m × 2 rad = 3 m |
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If angular acceleration is negative, which of the following statements could be true? Angular velocity is positive and decreasing Angular velocity is negative and decreasing Angular velocity is constant Angular velocity is positive and increasing |
Angular velocity is positive and decreasing |
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During the latter portion of the swing phase of a walking stride, the knee is extended from 65° to 5° over a period of 0.12 s. What is the angular velocity? -500°/s 541°/s 583°/s -583°/s |
-500°/s |
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Motion where all points of an object travel the same distance along a curved path is considered angular motion. True False |
False |
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The final angular velocity (wf) would be 50°/s if the initial angular velocity was -200°/s (wi) and angular acceleration (a) was 50 °/s^2 for 3 s (t) True False |
False a = (wf - wi)/t Wf = -50°/s |
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The angular displacement would be 900° for a diver completing 2.5 somersaults. True False |
False |
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An object will continue to move in the same direction and with the same velocity until a force causes a change in motion is which law of motion? Law of Inertia Law of Acceleration Law of Force Law of Action-Reaction |
Law of Inertia |
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What are the base units for a Newton? Kg-m/s^2 Kg-m/s M/s/s Ns |
Kg-m/s^2 |
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How much force would be needed to accelerate an object (mass = 2 kg) 10 m/s^2? 5 N -5 N 0.2 N 20 N |
20 N |
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What would be the horizontal force component of a 500-N force acting at 60° from the horizontal? 8.3 N 250 N 433 N 1000 N |
250 N Fx = Rcos(theta) Fx = 500cos60 = 250 N |
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True |
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2. |
F, negative |
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Third class levers, where the effort and resisting forces are on the same side of the fulcrum, are most prominent in the body. |
T |
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Second class levers require large effort forces relative to resistant forces and maximize the speed of movement. |
F, smaller effort force |
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Decreasing moment if inertia by going from a laid out to tucked position when doing a back flip allows one to rotate quicker. |
T |
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To work your delts more during a lateral arm raise, bend your elbows slightly, bringing weight closer to trunk. |
F, farther away |
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The moment arm for mscle force remains constant throughout entire range of motion. |
F |
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Increasing stability can be done by raising the height of the COM or increasing its mass. |
F |
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A positive net moment indicate that angular acceleration is occuring. |
T |
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The sum of torques about the COM of an object always equals zero. |
F |
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An MA > 1 indicates the effort arm exceeds the resistance arm, which magnifies the moment created by the effort force. |
T |
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The only force creating a moment about the shoulder when an arm is held out to the side is the weight of the entire arm. |
F |
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The moment arm is always measured from the point of application of the force to the axis of rotation. |
F |
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Moment of Inertia about an axis always passes through the center of mass of a segment. |
F |
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The moment of inertia about an axis through the center of mass is less than the moment of inertia about any other perpindicular axis running through any other point on the segment. |
T |
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Once a gymnast leaves the vault, angular momentum remains constant while airborne if air resistance is neglected. |
T |
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Resistance of a thigh to rotate about its longitudinal axis is greater than its resistance to rotate about the mediolateral axis. |
F |
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Moment of force = moment = _______ |
Torque |
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Magnitude of torque is the product of ______ and the perpindicular distance from axis of rotation to line of action |
Force |
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A torque results when the line of action of a force acts at a distance from an _______ |
Axis of rotation |
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Levers 1, 2, 3 |
Lever types |
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The study of forces that cause motion (ex. torque, gravity, friction, etc.) and can be classified into two groups; Linear and angular motion. |
Kinetics |
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The study of describing movement (ex. displacement, time, velocity, etc. |
Kinematics |
