It’s professor dave, I want to tell you about kinetic and possible force. We now understand a more rigorous technical clarity of the word energy as being these capabilities to do work, but as we said, there are a few different kinds of energy, so we must talk about all of these smorgasbords. First we will discuss kinetic energy and possible vigor. Kinetic vigor is the energy an objective retains by virtue of its flow. If we recall Newton’s second statute, we know that the application of some net force will move an objective with some mass at some constant acceleration. We also know that work is equal to force period interval, so if we account for the interval travelled by this object we get that W equals Fd equals mad or simply W equals mad. We also know of this kinematic equation for an object experiencing constant acceleration. If we answer for ad we get this showing which can be plugged into the above equation for labour. After some simplification, we arrive here, thus descending the work-energy theorem. This call, one-half mass ages velocity squared, represents the kinetic energy of a system.So now we can express the work-energy theorem by saying that when an external oblige does work on a arrangement the amount of work will be equal to the change in kinetic energy of the system. If w is positive, the system increases its kinetic energy, and the vary will be equal to the work done on the system. If w is negative, the system lessens its kinetic energy, and this change will represent the work that is done by the system. Note the presence of mass in the kinetic energy expression. This means that if two objects with different mass are moving at the same velocity, the more big objective is certainly have more kinetic energy. Now let’s discuss potential energy, which is forever intertwined with kinetic energy. Potential vigour is the energy an object retains by virtue of its position in a field, whether that is a gravitational battleground, an electromagnetic field, or any other type of field. If you promote a ball up into the air, you’re increasing its gravitational possible vigour as it moves farther away from the soil. If you secrete the pellet, that possible energy is converted into the kinetic energy of flow as it falls.The closer an object is to the center of gravity of the earth, the less possible vigor it has, and as you pluck it up and away from the grind it gains possible intensity because it has an increasing capability to fall some length to the ground. It may seem strange to bestow an objective with more intensity merely by lifting it into the air, but remember that we have to eliminate our prior understanding of the word energy in favor of more rigorous descriptions. The potential power of a tightened spring or an arrow ready to be liberated from a kowtow is where the kinetic energy of flow comes from. It is like a kind of placed vigour. In this course we will frequently be considered by gravitational possible exertion for objectives on earth, and for any object this will be equal to the mass of the objective in kilograms, terms the freefall acceleration due to gravity for the earth, epoch the height of the object in rhythms. The greater the altitude, the greater the potential energy, as this represents the work that can be done by gravity to produce the action of a come object.There is also elastic possible vigour, such as with the springtime or the bow and arrow, and we will discuss this later as well. For now, we just need to understand kinetic energy as the exertion of flow and potential energy as the force of point. Thanks for watching guys, expressed support for my path for more seminars, reinforce me on patreon so I can remain doing content, and as ever feel free to email me :.
