Some energy transfers or energy transformations can be seen, heard, or felt.Energy can be stored and transferred from one form to another form.Energy can neither be created nor be destroyed it always remains conserved.The entire masses/matter possesses energy.So, work done is zero.Įnergy: Definition, Dimension, Unit and Formula.Įnergy Definition Physics: Energy of a body is defined as its capacity or ability to do work.Įnergy Equation: Change in K.E. For example: The work done in pushing an immovable wall is zero, because displacement of the wall is zero. Zero work: When the body gets displaced along a direction perpendicular to the direction of applied force then, the work done on an object is said to be zero work.For example: when we apply brakes to a moving bicycle the work done by the brake is negative because the braking force and the displacement act in opposite directions. Negative work: When the applied force and the displacement are in the opposite directions then, the work done on the body is said to be negative work.For example: when a horse pulls the cart, the cart is displaced in the direction of force applied. Positive work: When force(applied) along with displacement which are in the same directions then, the work done on the object is said to be positive work. Work done, is a scalar quantity and its magnitude may be positive, negative or zero. Where, F is component of the force and d is magnitude of displacement. SI unit of work or work done unit or Work units: The SI unit of work is Joule (J).Įxamples of work done: a man climbs up the hill, a horse pulls a cart an engine pulls a train etc. The object should move in the direction of force. This work is said to be done on a body if it satisfied the below two conditions:Ģ. Work Definition: Work is said to be done when the force acting on the body and the body moves through some distance in the direction of force. Power (Watt) = \(\frac \) = 40 J/s.ĭownload the Toppr – Best Learning App for Android and iOS or signup for free.Work: Definition, SI unit, Example and What is the formula for work? Besides, we calculate it mathematically using this formula or equation. We can refer to power as the rate at which we do work. Besides, in the above case, the hiker has greater power rating than the rock climber. Also, the quantity that has something to do with the rate at which a certain amount of work is done is called power. On the other hand, a rock climber might take relatively more time to elevate her/his body up a few meters next to the side of a cliff.Īlthough, both of them do the same work but the rock climber might take more time than the trail hiker. In addition, there are times when we do work quickly and there are times when we do work rather slowly.įor example, a trail hiker (One who selects an easier path up the mountain) can elevate her/his body a few meters in a short amount of time. Moreover, work has nothing to do with the amount of time, which this force acts to cause the displacement. Also, quantity work has to do with a force causing a displacement. Power refers to the quantity of work done by a body.
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