https://m.youtube.com/watch?v=u24c8uorkgo

{source}<iframe width="560" height="315" src="https://www.youtube.com/embed/u24c8uorkgo" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>{/source}

Outputs

https://iwant2study.org/ospsgx/index.php/interactive-resources/physics/02-newtonian-mechanics/08-gravity/153-epub3-gravity 

1. 20170803gravity.epub updated with better simulations
2. Google book version
3. iBook (require any of the 51 countries supported by ibook, excluding Singapore iTunes account, please use the Digital Library copy link above )

https://iwant2study.org/ospsgx/index.php/interactive-resources/physics/02-newtonian-mechanics/09-oscillations/154-epub3-shm

1. 20170720shm.epub updated with better controls, dropdown menu 
2. Google book (not so latest, takes a day to upload) version,
3. iBook (not updated frequently as it requires US store account) version.

end faq

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