A Level Physics Practice Exam

To calculate the power developed by an athlete climbing stairs, which of the following measurements is NOT required?

1. The athlete's weight

2. The height of the stairs

3. The distance traveled horizontally

4. The time taken to climb the stairs

The correct answer is: The distance traveled horizontally

To determine the power developed by an athlete climbing stairs, the key measurements needed involve the force applied, the vertical displacement, and the time taken for the climb. The athlete's weight is essential because it allows for the calculation of the gravitational force that needs to be overcome as they ascend. The height of the stairs is critical as it defines the vertical distance over which the work is performed, and this work is directly related to the potential energy change due to gravity. The time taken is necessary to calculate power, which is the rate at which work is done. The horizontal distance traveled is not required to calculate the power in this context, as power depends primarily on the work done against gravity (vertical movement) and the time taken, rather than any horizontal motion. Therefore, that measurement is not necessary for this specific calculation of power in climbing stairs.