The space shuttle travels in orbit, covering 2310 km in 5 minutes. How fast is that? Follow example below. Variables:
Equation:
Solve:

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )

prndulum needs thread, weight clock to time swings

gravitational energy

electrical energy

kinetic energy

ligh energy