So I just have to calculate how much kinetic energy wasĪdded when the car accelerated. So in this example, if we find out that 10,000 joules of kinetic energy was added to this body, then it means that the workĭone was 10,000 joules. And the equation is basically saying that the work done onĪ body basically tells how much kinetic energy And this equation canīe derived from here. So work done equals final kinetic energy minus the initial kinetic energy. Which says that work done equals change in kinetic energy. What do we do? Well, maybe we can use this data and calculate what forceĪnd displacement is and then substitute and calculate, right? But guess what, we'veĪlready done this before! If we were to plug in for F equals MA and somehow substitute all of this, we will eventually arriveĪt an equation called the Work Energy Theorem We are only given the initial and the final velocities and the mass. ![]() Do I know what the displacement is? That's also not given. Okay, now do I know what the force is? No, that's not given in the problem. So, how do we calculate work? Well, we have seen now for quite a while, work done is calculatedĪs force acting on a body multiplied by theĭisplacement of that body. Truck, that's given to be, let's just write that down How much is the work done on this truck, given its mass is 2,000 kilograms. It goes a little faster so now it is at 30 meters per second. Going at 20 meters per second, let's write that down. Truck before accelerating, so before it accelerates it's We are given that the truckĪccelerates from 20 to 30, so let's say here is our Okay, let's go ahead andĭraw a situation for this. Find the work done on the truck, given its mass is 2,000 kilograms. ![]() Here's the first example: A truck accelerates fromĢ0 meters per second to 30 meters per second. Solve a couple of problems on calculating work when
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |