A student did an experiment to calculate her power.
The diagram below shows how she obtained the measurements needed.
The student first weighed herself and then ran up a flight of stairs. A second student timed how
long it took her to go from the bottom to the top of the stairs. The height of the stairs was also
measured.
13.2 m
(a) Complete the following sentence.
To run up the stairs the student must do work against
the force of
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Work done and energy are both measured in joules. This is because work done is equal to energy transferred. A person who has climbed to the top of a flight of stairs has transferred chemical energy stored in their muscles to the gravitational potential energy (GPE) they have when standing at the top. Here the work done (measured in joules) is equal to the GPE transferred (also measured in joules).
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