Write model.md

[samreid]

No description provided.

[AgustinVallejo]

Model.md is ready for review, assigning @DianaTavares

[DianaTavares]

Hi team!

What questions should the model answer?
The document is a description of each screen in each of the 3 sims. This is what I expected to see in a teacher tips document.

I don't have a lot of experience with this. I expected the equations, libraries, limitations, units, etc.

I decide to review other models to compare:

• Kepler also describes each screen, but also includes, units, trajectories, and other data.

• CCK-common is also a site, and @zepumph (who created the issue, not sure who wrote the model) describes something different, like the principal variables and data of the sim.

• While ESP has equations.

Does the model have a checklist of what to include or what questions to answer?

[AgustinVallejo]

Discussed today on standup:

• Maybe base off https://github.com/phetsims/gas-properties/blob/main/doc/model.md for better reference
• Include more constants and symbols. i.e. L -> m^3, how displaced volume is calculated
• Describe how decimals are shown (1.11 vs 11.1)
• Link common model.md in individual repos https://github.com/phetsims/density-buoyancy-common/blob/main/doc/model.md
• Describe the boat logic
• Describe the dynamics of the contact force: scale weirdness, dragging, etc.
• How System A is calculated
• Zoom factor 2x
• Add mystery material density values

[AgustinVallejo]

Back to youu @DianaTavares, I addressed the discussed items. If you think it's done, feel free to close, or assign back otherwise.

[DianaTavares]

It is perfect thanks!!