Last Week Some problems. There were many problems with significant figures, units and showing your work. Here is an example from the pendulum experiment. 7. Calculate the correction factor ?. 0.09 Last Week The free fall measurement of g experiment posed questions about how the rotation of the earth affects gravity. The main answer is that the spinning of the earth does NOT cause gravity. Gravity is a fundamental force that only depends on mass and distance. Last Week The Earth's mass causes gravity, which causes apples to fall to the ground. But the rotation of the Earth does give an effective force that competes with gravity and slightly reduced the apple's acceleration. Last Week f Today: Sound Sound is a longitudinal wave. The speed of the wave depends on the medium. Movie Longitudinal Wave The speed of the wave depends on the medium. Frequency, f . T (period) = 1 If . Remember that product of wavelength and frequency is always the same (v=velocity of ...