Coin and Pendulum - Timing, Spacing and Arcs animation

In the second animate class I created a series of different animations that demonstrate timing, spacing and Arcs which are fundamentals in animation. 

The first excersive demonstrates speed in relation to spacing, when spaced closely together the coin moves at a constant speed where as when the coin is more spaced out it appears to speed up and down. The onion skin below displays the spacing used to make the coin move:


  

When played the coins show different varies of speed:

The second exercise demonstrates the physics of an arc via the use of a pendulum.

The first demonstration is wrong due to the coin not having any arc to follow and the physics are off: 

The other two display the use of an arc that creates a more realistic movement, the first one is equally spaced, which moves at an equal speed the second however is more realistic as it appears to slow down and speed up on the arc as the coins aren't equally spaced.