Now, any measurement is also a physical interaction between two or more systems.

When heat energy increases in a simple system, physical and chemical interactions change.

What we have together is independent of the physical interaction.

The system is hands free and requires no physical interaction.

Grooming or physical interaction is a way to show how close you are to another individual.

Therefore,this type of art is incomplete without the viewers physical interaction.

At the same time, it was an object meant for physical interaction.

The accent is on the physical interaction of the performers.

The department doesn't want you involved in any physical interaction with the inmates.

Why has everyone suddenly become afraid of actual physical social interaction?