In physics lab, Piper attaches a wireless sensor to one of the spokes of a bicycle wheel spinning freely on its axle. The graph below shows the sensor's height above the ground, in centimeters, over time t, measured in seconds.

Question

What is the midline and what does it represent in this context?
Time (in seconds)
Sensor's height (in cm)
Time (in seconds)
Sensor's height (in cm)
(2.5, 73)
(6.5, 73)
(4.5, 25)
(0.5, 25)

Answer 1

The midline is the horizontal line that represents the average or equilibrium height of the sensor above the ground. In this context, the midline represents the average height of the sensor above the ground as the bicycle wheel spins freely on its axle.