All technology we rely on, from cars to smartphones, are designed Physical use. You do not need to know science to use these things. But a comprehensive person should understand at least some main concepts – with some music, art, history and economy. Robert Heinlein said all in Time is enough for love:
“People must be able to change diapers, plan to invade, kill pigs, control ships, design a building, write a poem, balance account, build walls, build bones, comfort the dying person , receive orders, order, cooperate, act alone, solve equations, analyze a new problem, fertilize, computer programming, cook a delicious meal, fight effectively, die bravely have a cold. The expertise is about insects. ”
So, in order not to be insects, this is my top five physical equations that you should know.
1. Law II Newton
I'm sure you've seen this before – it's over 300 years old and it is very popular on scientific memes and T -shirts. It says that synthesizing effect on an object is equal to its mass (I) acceleration (One). But what does that really mean? It is all about interaction – like when you kick a football or drop the bottle of water on the floor.
Newton's second law says we can describe these interactions with the concept of “force”. And what is the force? The force of synthesis works on an object that changes the movement of that object. But wait! There are many more interesting things in this seemingly simple equation.
See those arrows F And One? That indicates that variables are vectors, meaning they contain more than one information. For example Who knows? You can go 1 meter to the east or west or 39 degrees from the north. The distance itself is not the whole story; You also need to specify one direction. This is true for both force and acceleration. Other quantities (such as mass or temperature) without direction. We call those scalar values.
Newton's second law is extremely helpful, but strangely, it seems people don't believe it. The common misconception is that the force is constant, causing the object to move at a constant speed. Rather, what this equation says is that if you click on an object with a stable force, it will continue to accelerate.