Usability on small screens review

[KatieWoe]

Template for Issues:
Per @kathy-phet's request in phetsims/qa#295 I am making issues in each published sim repo detailing the pointer areas and usability of sims on phone sized screens. Done on an iPhone 7 iOS 12 device.

Potential Difficulties Noticed:

• The pointer areas could all be a bit hard to grab, particularly the buttons.
• Looking at RIAW may help with the slider areas

Screenshots:

[arouinfar]

Thanks @KatieWoe. I believe these issues have already been addressed in the updated design of Ohm's Law, which we're in the process of redeploying.

I'll go ahead and close this issue.