The whole technology we rely on, from cars to smartphones, was designed with physics. You don’t have to know learning to utilize these things. But a well-rounded man should understand at least some of the key concepts with music, art, history and economy. Robert Heinlein said it all Sufficient time for love:
“The human being should be able to change the diaper, plan the invasion, butcher and pork, ship, design a building, write a sonet, balance, build a wall, set a bone, comfort dying, take orders, give orders, cooperate, act yourself, solve the equations yourself, Analyze a new problem, manure at height, program a computer, cook a tasty meal, fight effectively, die. Specialization is for insects. “
So, in the interest of the lack of insects, here are my five physics equations that you should know.
1. Newton’s second law
I am sure you saw it earlier-over 300 years ancient and is popular in scientific memes and T-shirts. Says that the net force on the facility is equal to its mass (M) Acceleration times (AND). But what does that really mean? It’s about interactions – for example, when you kick football or drop a bottle of water to the floor.
Newton’s second law says that we can describe these interactions with the concept of “strength”. What are the strength doing? The net force on the facility changes the movement of the object. But wait! There are a few cold things in this uncomplicated equation.
See these shots F AND AND? This indicates variables that are vectors, which means that they contain more than one information. For example, if someone asks you for “social distance” by 1 meter, where would you finish? Who knows You can go 1 meter east or west or 39 degrees from the north. The distance itself is not the whole story; You also need to determine the direction. This applies to both strength and acceleration. Other amounts (such as mass or temperature) do not have a direction. We call these scalar values.
Newton’s second law is very useful, but strange, people don’t believe it. A common misunderstanding is that constant force causes the object to move at a constant speed. This equation says rather that if you press the object with constant strength, it will accelerate.