The standard unit of work is the Joule denoted as (J). In simple words, work is not complete until and unless force is applied, which moves an object. Science defines work as a task done when a force acts upon a body that produces displacement in it. However, the scientific term work done is not related to the stationary task. It can be either reading a book or sitting at your work-station to complete a job on the computer. Most often, you use the term ‘work’ to express doing some task. In this particular article, we shall be learning about the following concepts. The faculties have compiled this important concept of physics in this article and try to make you understand them in a simple way. So what is that which makes them work at a different speed? All your questions will be answered by the end of this article. So, are work and power interrelated concepts? Are they interdependent on each other for their functioning? When you see two weightlifters, lifting the rings you will see both are performing the same work but their speed might differ. Best Physics Tuition holds informative and engaging classes dedicated to helping students excel in O Level and A Level physics.Every day of your life you move through systems of power and that these powers make you perform your work. If you need any assistance or want to broaden your understanding of the subject, you can engage a reputable physics tuition teacher.
#Work equation physics how to
Knowing how to calculate these measurements in different situations will help immensely in your physics journey, as well as your exams. The concepts of work and power are crucial in the field of physics.
Formula: Power = Force (N) x Velocity in the direction of the force (m/s). Since Work done / Time taken = Power, and Displacement / Time taken = Velocity, we can simplify the formula to: Work done / Time taken = Force x (Displacement / Time taken) After doing so, the equation we are left with is: This equation is derived by simply dividing both sides of the equation for work done by the time taken. Power can also be defined in terms of force and velocity. Formula: Power = Work done (J) / Time taken (s). Power is mathematically defined as the work done divided by the time taken. This would, in turn, allow the car to travel faster. More ‘powerful’ engines would be able to convert the chemical energy in fuel to heat and mechanical energy at a fast rate. To visualise this concept, consider car engines. Power is an essential measurement because the rate at which you can convert one form of energy to another is just as important as the raw amount of work done. In other words, it is the work done per unit time. Power describes the rate of energy conversion. Formula: Work done by expanding gas = Pressure (Pa) x Change in volume (m 3). Work done = Pressure x Area x Displacementįinally, since Area x Displacement = Change in volume, we get our final formula which describes the work done by an expanding gas against a constant external pressure: We can then substitute this into our formula for work done, which leaves us with While you only need to know the final formula for your exams, it is best to understand how it is derived from the base equations.įirst, recall the equation for calculating the pressure of gases. We use expanding gases in a bunch of technologies, from pistons in car engines to explosives for demolishing buildings. One such situation is when we deal with the work done by an expanding gas. But there are situations where these values must be derived first. 
This formula can be applied in a straightforward manner if we know the exact amount of force and resulting displacement.
Formula: Work done = Force (N) x Displacement in the direction of the force (m). With this in mind, here is the formula for work done: This distance travelled can also be thought of as a change in position, and hence be referred to as the “displacement”. In mathematical terms, it is defined as the product of the force being applied on an object, and the distance that it travels in the direction of that force. The work done by a force is a measurement of the energy transfer that occurs when a force is applied on an object, causing it to move. In this article, we will discuss these two intertwined concepts and present the definitions and formulas that surround them. 
However, these words tell a very different story in the field of physics. You may say that you “got a lot of work done today” or “that was a very powerful speech”. In everyday life, the terms “work done” and “power” can mean a lot of things.
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