There are several ways one can make a working model of an earthquake. You can use an empty 2 liter bottle, clay, baking soda, and dish detergent to make a working earthquake.
Working model for what, exactly?
manhattan
a physics model can be excellent if it has a right demonstration correct working and display and capability to impress the audience right;y
Don't make it
First, get a good understanding on the "anything" you want to model.
If you want to make a WORKING model for nuclear physics, look at the Manhattan Project, and you'll be joining Miss Curie. Please rephrase the question or figure out what it is exactly you should be asking for.
In order to make a working model on force and pressure, the relationship between these two things must be determined. This can be inferred from physics formulas.
Gyroscope will make a good working model .
A Burgular Alarm
Gyroscope will make a good working model .
Ask your teacher.
see your physics book