physica runs on the openSUSE Linux workstations that are found in the Physics Department labs, including MCB203, MCH200 and MCH300. For example, in B203 (the lab across the hallway from the Physics Office, where you have your 2P20 labs) you will find several Linux workstations, powerful dedicated machines with high-resolution monitors.
To run physica all you need is to type
physica
at the prompt (shown as ab11cd@terminalID:->).