Define work? Give SI unit of work? Can you write an expression for positive work done?

Hi Ashish, Work is the energy required to move an object against a force. Work is equal to the force times the distance the object moves. The SI unit for work is the joule. In the case of a constant force, work is the scalar product of the force acting on an object and the displacement caused by that force. Though both force and displacement are vector quantities, work has no direction due to the nature of a scalar product (or dot product) in vector mathematics. This definition is consistent with the proper definition, because a constant force integrates to merely the product of the force and distance. The SI units for work are the joule (J) or newton-meter (N * m), from the function W = F * s where W is work, F is force, and s is the displacement. The joule is also the SI unit of energy. How is work defined in science? To understand this, we shall first consider the case when the force is acting in the direction of displacement. Let a constant force, F act on an object. Let the object be displaced through a distance, s in the direction of the force. Let W be the work done. We define work to be equal to the product of the force and displacement. Work done = force × displacement W = F s(1) Thus, work done by a force acting on an object is equal to the magnitude of the force multiplied by the distance moved in the direction of the force. Work has only magnitude and no direction. In Eq. (1), if F = 1 N and s = 1 m then the work done by the force will be 1 N m. Here the unit of work is newton metre (N m) or joule (J). Thus, 1 J is the amount of work done on an object when a force of 1 N displaces it by 1 m along the line of action of the force. All the best.

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Work is said to be done by the applied force if it point of application is displaced. SI unit is joule. If force acts upon the body such that energy of body increases then work done is positive Work done = magnitude of scalar product of force and displacement.

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It is the capacity of doing work.

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Product of force and displacement in the direction of force is called as work done. The SI unit for work is 'Joule'.

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