This could be an animation or a video.
We find that the motion of a simple pendulum does not depend upon
the mass that is swinging. What, then, determines the period of
such a simple pendulum? The length of the string l and the acceleration
due to gravity g determine the period
Pause. Leave the above text on the screen and add this paragraph. The equation could also appear over in the "photo area" in large type.
Also leave the figure, animation, or video from the previous screen
in place, add this short paragraph (line plus equation) and put
the equation underneath the figure, animation, or video.
We can calculate the period using this equation,
The length of a pendulum on a clock can be adjusted to make the
clock run faster or slower. A prospector or a geologist can use
a carefully calibrated pendulum and some other time keeping device,
like a quartz watch, to measure the local value of the acceleration
due to gravity. The acceleration due to gravity may be a little
greater over a large deposit of minerals such as lead and it may
be a little less over a large deposit of oil.
Leave the figure, animation, or video from the previous two screen in place, replace the previous text with this paragraph, and remove the bold-faced equation from the "photo area".