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5 physics equations that everyone should know

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All the technology in which we trust, from cars to smartphones, was designed with physics. You don’t need to know science to use these things. But a complete human must understand at least some of the key concepts, along with some music, art, history and economy. Robert Heinlein said everything in Enough time for love:

“A human being must be able to change a diaper, plan an invasion, kill a pig, connect a ship, design a building, write a sonnet, balance accounts, build a wall, establish a bone, comfort the dying, take orders, give Orders, Coopere, act alone, solve equations, analyze a new problem, set up a computer, cook a tasty meal, fight efficiently, die galantely. Specialization is for insects. “

So, in the interest of not being insects, these are my main physics equations that you should know.

1. Newton’s Second Law

I am sure you’ve seen this before, he is over 300 years old, and is popular for scientific memes and t -shirts. He says that the net force on an object is equal to its mass (metro) Time acceleration (to). But what does that really mean? These are interactions, such as when you put a football ball or let a bottle of water on the floor.

Newton’s second law says we can describe these interactions with the concept of “force.” And what do the forces do? The net force on an object changes the movement of the object. But wait! There are many more great things in this simple aspect equation.

See those arrows F and to? That indicates variables that are vectors, which means that they contain more than one information. For example, if someone asks you to “socially distan” by 1 meter, where would it end? Who knows? It can go to 1 meter east or west OA 39 degrees from the north. The distance itself is not the complete story; You must also specify an address. This is true for both forces and acceleration. Other quantities (such as mass or temperature) have no direction. We call those scalar values.

Newton’s second law is super useful, but strangely, people don’t seem to believe it. The common wrong idea is that a constant force causes an object to move at a constant speed. What this equation says, rather, is that if you push an object with stable force, it will continue to accelerate.

(Tagstotranslate) Physics

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