Biomechanics II Practice Exam Paper
Biomechanics II Practice Exam
1. Why is it important to video your subject from as far away as possible, and then zoom in? a) b) c) d) reduces parallax errors gives you the opportunity to better frame the picture helps stop you missing data makes no difference
2. What would the differential of angular displacement vs. time data give? a) b) c) d) angular acceleration vs. time angular velocity data vs. time linear displacement vs. time tangential velocity vs. time
3. Conventional NTSC video equipment operates at ..................... Hz. a) b) c) d) 50 60 100 depends on whether or not it is high definition
The next four questions refer to the following graph that shows the knee angular displacement versus time data for one stride of …show more content…
Which letter on the curve would represent the approximate point of toe-off? a) b) c) d) 1 Biomechanics 2 – Practice Exam
5. Which letter on the curve would represent the approximate point of mid-stance? a) b) c) d) 6. What is the approximate angular velocity at point d? a) b) c) d) 115 deg 150 deg/s 115 deg /s 0 deg/s
7. The graph you would prepare to illustrate force summation between a number of segments would be a/an ………………………… versus time. a) b) c) d) linear acceleration angular displacement linear velocity linear displacement
8. What is represented by a negative slope above the x-axis in a knee angular velocity versus time graph? a) b) c) d) decelerating knee extension accelerating knee extension decelerating knee flexion accelerating knee flexion
9. What is represented by a negative slope above the x-axis in an acceleration versus time graph of the CoG? a) b) c) d) Decreased rate of deceleration Increased rate of acceleration Decreased rate of acceleration Increased rate of deceleration
10. When the double differential of noisy displacement-time data is taken, what will happen to the size of the errors? a) b) c) d) will not change increase markedly decrease slightly increase …show more content…
Propulsive GRF (ground reaction forces) during running would be measured in the ........ plane. a) b) c) d) x-z y-x z y-z
14. Which of the following represents one of the limitations in using force platforms for gait studies? a) b) c) d) high price difficulty in installation for running small size of the platform poor sensitivity
15. Which of the following is not a source of noise during surface EMG? a) b) c) d) electrolyte (conducting material) filter in the amplifier skin electrode
16. A full wave rectified EMG signal represents .............................................. a) b) c) d) the raw EMG signal the raw EMG signal with the sign of all negative voltages reversed the change in EMG over time the rate of change of the raw EMG signal
3 Biomechanics 2 – Practice Exam
17. Is possible to differentiate between motor unit recruitment and rate coding using surface EMG? a) b) c) d) Only if IEMG (integrated) recordings are taken Yes Only if the electrode placement is very precise No
18. The following questions relate to the graph below that shows the sagittal plane knee, hip and pelvic angular velocities for an AFL kicker (0 s = ball contact)?
Pelvis Hip Knee 500 1000
Velocity (deg/s)
-0.30
1. Why is it important to video your subject from as far away as possible, and then zoom in? a) b) c) d) reduces parallax errors gives you the opportunity to better frame the picture helps stop you missing data makes no difference
2. What would the differential of angular displacement vs. time data give? a) b) c) d) angular acceleration vs. time angular velocity data vs. time linear displacement vs. time tangential velocity vs. time
3. Conventional NTSC video equipment operates at ..................... Hz. a) b) c) d) 50 60 100 depends on whether or not it is high definition
The next four questions refer to the following graph that shows the knee angular displacement versus time data for one stride of …show more content…
Which letter on the curve would represent the approximate point of toe-off? a) b) c) d) 1 Biomechanics 2 – Practice Exam
5. Which letter on the curve would represent the approximate point of mid-stance? a) b) c) d) 6. What is the approximate angular velocity at point d? a) b) c) d) 115 deg 150 deg/s 115 deg /s 0 deg/s
7. The graph you would prepare to illustrate force summation between a number of segments would be a/an ………………………… versus time. a) b) c) d) linear acceleration angular displacement linear velocity linear displacement
8. What is represented by a negative slope above the x-axis in a knee angular velocity versus time graph? a) b) c) d) decelerating knee extension accelerating knee extension decelerating knee flexion accelerating knee flexion
9. What is represented by a negative slope above the x-axis in an acceleration versus time graph of the CoG? a) b) c) d) Decreased rate of deceleration Increased rate of acceleration Decreased rate of acceleration Increased rate of deceleration
10. When the double differential of noisy displacement-time data is taken, what will happen to the size of the errors? a) b) c) d) will not change increase markedly decrease slightly increase …show more content…
Propulsive GRF (ground reaction forces) during running would be measured in the ........ plane. a) b) c) d) x-z y-x z y-z
14. Which of the following represents one of the limitations in using force platforms for gait studies? a) b) c) d) high price difficulty in installation for running small size of the platform poor sensitivity
15. Which of the following is not a source of noise during surface EMG? a) b) c) d) electrolyte (conducting material) filter in the amplifier skin electrode
16. A full wave rectified EMG signal represents .............................................. a) b) c) d) the raw EMG signal the raw EMG signal with the sign of all negative voltages reversed the change in EMG over time the rate of change of the raw EMG signal
3 Biomechanics 2 – Practice Exam
17. Is possible to differentiate between motor unit recruitment and rate coding using surface EMG? a) b) c) d) Only if IEMG (integrated) recordings are taken Yes Only if the electrode placement is very precise No
18. The following questions relate to the graph below that shows the sagittal plane knee, hip and pelvic angular velocities for an AFL kicker (0 s = ball contact)?
Pelvis Hip Knee 500 1000
Velocity (deg/s)
-0.30