When do you use physics?

Answer 1

You may never have to use physics. But physics can be applied everywhere. Your weight is a matter of physics, since weight is a force caused by gravity. Your eyesight is a matter of physics, where what you see is based upon light waves, diffraction of waves, and refraction of waves. What you hear is also a matter of physics, where sound waves have wavelengths of approximately 340 m/s. The whole universe is governed by physics through a universal law of gravitation (which also keeps our solar system in sync). Even your energy is a matter of physics, with potential energy (that which you have not used yet) and kinetic energy (energy used when in motion). And, last but not least, electricity and magnetism are both components of physics. These are just a few examples of the numerous times you can use physics in your life.