Hang-Time

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					                            Hang-Time                                                          Hang-Time

Purpose: Use Kinematics equations and simple tools                 Purpose: Use Kinematics equations and simple tools
(yardstick, stopwatch, and calculator) to measure the “hang        (yardstick, stopwatch, and calculator) to measure the “hang
time” of a jump and the height of an object.                       time” of a jump and the height of an object.

Materials:     yardstick                                           Materials:     yardstick
               stopwatch                                                          stopwatch
               ball                                                               ball
               calculator                                                         calculator

Challenge:                                                         Challenge:
1. Choose one person in your group to jump. Using a                1. Choose one person in your group to jump. Using a
   yardstick as a stopwatch, calculate the “hang-time” of the         yardstick as a stopwatch, calculate the “hang-time” of the
   jump.                                                              jump.
2. Find a tall object. Using a stopwatch as a ruler and a ball,    2. Find a tall object. Using a stopwatch as a ruler and a ball,
   calculate the height of that object.                               calculate the height of that object.

Data:                                                              Data:
1. Organize your data into a table.                                1. Organize your data into a table.
2. Use multiple trials.                                            2. Use multiple trials.
3. Show the formulas that you used and all of your                 3. Show the formulas that you used and all of your
   calculations.                                                      calculations.
4. Determine the uncertainty of your measurements and              4. Determine the uncertainty of your measurements and
   calculate the percent uncertainty of your calculations.            calculate the percent uncertainty of your calculations.

Analysis:                                                          Analysis:
Discuss your results, the percent uncertainty, problems that you   Discuss your results, the percent uncertainty, problems that you
may have encountered, and further questions.                       may have encountered, and further questions.


Bonus: It is said that a man that goes by the name, Earl "The      Bonus: It is said that a man that goes by the name, Earl "The
Goat" Manigault, was measured to have a vertical jump of 52        Goat" Manigault, was measured to have a vertical jump of 52
inches. How long was his hang-time?                                inches. How long was his hang-time?