So, depending upon the size of your students, you should expect the power they develop to be roughly 100 watts. After the students have completed the activity, ask them how long they think they could keep running up stairs at the same speed. Try to relate the power they developed to the power required to keep one 100 watt light bulb burning. Remember, as long as the light is on, work is being done at the rate of 100 joules per second to keep the bulb burning. Power is work per time, but to keep doing work or to keep delivering energy, you must keep producing the power for the length of time required to do the work.
Force is a push or a pull.
Work is done when a force is applied through a distance. Back to backgound material on Force, Work and Power Student Activities on Force, Work and Power.