Chapter 11 Laboratory Experiences
1. Perform the experiment shown in Sample Problem 1 in this chapter. Record the linear distances traveled by the three balls and write a brief explanation. Distances:
Explanation:
2. With a partner, use a goniometer to measure range of motion for wrist flexion and hyperextension, for ankle plantar flexion and dorsiflexion, and for shoulder flexion and hyperextension. Provide an explanation for differences in these ranges of motion between your partner and yourself.
3. Observe a young child executing a kick or a throw. Write a brief description of the angular kinematics of the major joint actions. What features distinguish the performance from that of a reasonably skilled adult?
Hip kinematics:
Knee kinematics:
Foot/ankle kinematics:
4. Working in a small group, observe from a side view two volunteers performing simultaneous maximal vertical jumps. Either videotape (and replay) the jumps or have the subjects repeat the jumps several times. Write a comparative description of the angular kinematics of the jumps, including both relative and absolute angles of importance. Does your description suggest a reason one jump is higher than the other?
5. Tape a piece of tracing paper over the monitor of a videocassette recorder. Using the single-frame advance button, draw at least three sequential stick-figure representations of a person performing a movement of interest. (If the movement is slow, you may need to skip a consistent number of frames between tracings.) Use a protractor to measure the angle present at one major joint of interest on each figure. Given 1y30 s between adjacent video pictures, calculate the angular velocity at the joints between pictures 1 and 2 and between pictures 2 and 3. Record your answers in both degree- and radian-based units.
Joint selected:
Angle 1: Angle 2: Angle 3:
Number of frames skipped between tracings:
Calculation: