We all do like 50 times a day. But did you know that there is physics in that? Probably. But I'll talk about it anyways. So when you go to open a door, there is a force at some angle theta. So, if you break that into its components, you have a horizontal towards you and a vertical force down. But only the horizontal force is acting to open the door. With that force, we can find the torque (T = Fdsin(theta)), the rotation of the door as it swings open. We can also find the angular velocity using w = d(theta)/dt. Just remember when someone opens the door for you, to be polite and say thank you. That's all on the physics of opening a door. Tune in next time on the world of physics.