![]() Let's say now you take that bowling ball and you drop it from some height. The mathematical version a little bit later, but before we do that, let's look at some more examples. If you don't do work at all, then the kinetic energy will not change. It basically says when you do work, you either add, or you remove the kinetic energy from the body. And this is, crudely speaking, what we call the work-energy theorem. You're doing negative work, you are removing the kineticĮnergy from the body. And now, when you're doing negative work, look at what happened To the displacement, work done is negative. Because your are pushing it in the opposite direction Slowing it down, right? But now think about the work done. When you try to catch that ball, your hand will start pushing it. Now when you try to catchĪ ball like this, again, your hand will move back a little bit. For example, imagine aīall is thrown at you, and you try to catch it. Now you can also do work and remove kinetic energy if you want. This is a new way of lookingĪt the same situation. Work is done on an object, kinetic energy gets added to that object. So we can now say that by doing work, we have added kineticĮnergy to our bowling ball. But then, after doing work, notice it has gained kinetic energy. ![]() You see, because you are pushing on it, and you are displacing that body, you are doing work on that ball, right? And when you're doing work, look at what happened to the ball. So you're putting a force,Īnd that accelerates the body. ![]() More than one forces, then we have to calculate the net force, but we'll talk about that later. To Newton's second law, which says F equals ma, which means force will accelerate a body. And whenever you putĪ force on any object, that object accelerates,Īnd therefore it speeds up, and that's why the ball became faster. You are throwing that ball, you are pushing on it, Why did the ball speed up? What is the answer? Well we can say, well, when ![]() What's gonna happen? Well, that ball will speed Imagine you take aīowling ball in your hand, and let's say you throw it. Help us look at the world in a completely different way. But it's time to answer the big question, why did we introduce these concepts? Because as we see, this will About work and energy for quite a while now. ![]()
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