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Work (W) is equal to the amount of energy transferred or converted by the force. Work is a scalar. S.I. unit is also the joule (J). where F is applied force, s is object's displacement while the force is applied and θ is angle between applied force and displacement.
Figure shows the position x of the lunchbox as a function of time t as the wind pushes on the lunchbox. From the graph, estimate the kinetic energy of the lunchbox at (a) t = 1.0 s and (b) t = 5.0 s. (b) How much work does the force from the wind do on the lunchbox from t = 1.0 s to t = 5.0 s.
Power (P) is the rate of energy transfer (energy transferred per unit tim e). As work is a measure of energy transfer, the rate of doing work = the rate of energy transfer , therefore:
Work W is the energy transferred to or from an object by means of a force acting on the object. Energy transferred to the object is positive work, and energy transferred from the object is negative work.
The change in kinetic energy due to applied forces is equal to the work done by the forces. Power is the rate at which work is done. The power provided by a force acting on an object is the scalar product of the velocity vector for that object and the force vector.
2 Work, energy and power. The work done on an object by a constant force F is F ∆x cos Θ , where F is the magnitude of the force, ∆x the magnitude of the displacement and Θ the angle between the force and the displacement. W = F∆x cos θ. W = F ∆x cos θ. Work in Joule scalar. MAGNITUDE.
This video explains the work energy theorem and discusses how work done on an object increases the object’s KE.
