Just update it  to a newer version.

Thanks to all those who have given me feedback. Here are the changes that I have made.

1. Inclusion of Height
2. KE and PE  to 1 d.p. (more accurate)
3. Able to change the mass
4. Fix bugs in the friction friction
5. Users can choose to pause the simulation when the object is slowing to 0.
6. Include the perfect circle
7. Include table of values
8. Rearrange the control settings to make it more user friendly.

Embedding not working, so you need to  download the latest version.