To show how energy is converted between different forms during different stages of a jump, then to use those different types of energy to determine some interesting characteristics of a jump.
For the purposes of this lab we will be examining three different stages of a jump: prelaunch, launch and maximum height. For the purposes of this lab we will be ignoring any energy that may be converted into thermal energy. A description of each phase of the jump is given below.
Prelaunch You are squatting down as low as you care to go, from this position you will rapidly rise to the next position. | Launch You are in a fully upright position, your feet are just about to leave the ground. | Max Height You are up in the air as high as you will go. |
In each case, the red dot represents your Center of Mass. (Check out how center of mass plays into the High Jump)
For this lab we will be accounting for three different types of mechanical energy in each phase:
These three types of energy all add up to the Total Mechanical Energy (TME).
1. How does the TME compare at each moment of the jump? Why is this?
2. At what phase will the jumper have the maximum:
SCE -
GPE -
KE -
3. What would be the best height to choose to be zero height? Why?
Jumper Mass:
Height At Prelaunch:
Height At Launch:
Maximum Height:
Use your data to fill out the table below and answer the following questions.
Position | SCE | GPE | KE |
Prelaunch | |||
Launch | |||
Max Height |
1. How many food Calories would you have to eat in order to have the energy to perform this jump? (1 food Calorie = 4184 J)
2. How fast were you moving when you left the ground?
3. What is the average force you needed to exert in order do the proper amount of work between the prelaunch and launch position?
How high could you jump if you used up all the energy in one Fun Sized Candy Bar (50 Calories)? How fast would you leave the ground? How much force would it take?
Answer these three questions by filling out the following:
TME in Joules =
Position | SCE | GPE | KE |
Prelaunch | |||
Launch | |||
Max Height |
Max height (m):
Take-off speed (m/s):
Average Force (N):
PHYSICS by MN Partnership for Collaborative Curriculum is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.