All the technologies we rely on, from cars to smartphones, have been engineered using physics. You don’t need to know science to use these things. But a fully comprehensive man must understand at least some key concepts – along with some music, art, history and economics. Robert Heinaline tested everything Enough time to love:
“One has to be able to change diapers, plan for attack, butcher, send a ship, design a building, write sonnets, balance accounts, build walls, build bones, encourage a man who is dying. , Instruct, order, cooperate, act alone, solve equations, analyze a new issue, pour fertilizer, plan a computer, cook a delicious food, fight effectively, die courageously. Specialty for insects.
So, in order to not be an insect, here are the five equations of my top physics that you need to know.
1. Newton’s second law
I’m sure you’ve seen this one before – it is 300 years old and is popular with scientific mims and t -shirts. Says the pure force entered into an object is equal to its mass (M) The load of acceleration (A). But what does it really mean? Everything is about interactions – like when you kick a football ball or throw a bottle of water on the ground.
Newton’s second law says that we can describe these interactions with the concept of “force”. And what do the forces do? The pure force entered into an object changes the movement of the object. But wait! There are other interesting things in this simple equation.
See those arrows F. And A? This represents the variables that are vector, meaning they contain more than one piece of information. For example, if someone asks you to get 1 meter away from yourself, where will you finally get? Who knows? You can go 1m to the east or west or 39 degrees from the north. The distance by itself is not the perfect story. You also need to specify a direction. This applies to both forces and for acceleration. Other quantities (such as mass or temperature) have no direction. We call those scaler values.
Newton’s second law is very useful, but strangely, people seem to not believe it. The common misconception is that a fixed force causes an object to move at a constant speed. What this equation says is that if you press the body with a constant force, its acceleration will continue.
