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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.
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. •There are only two relevant variables in one dimension: the force, Fx, and the displacement, Δx.
This video explains the work energy theorem and discusses how work done on an object increases the object’s KE.
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.
7.1. Work: The Scientific Definition. Explain how an object must be displaced for a force on it to do work. Explain how relative directions of force and displacement determine whether the work done is positive, negative, or zero. 7.2. Kinetic Energy and the Work-Energy Theorem.
3. Work-energy theorem The work done in the displacement by the force is defined as B A W(A B) F dr (1) where the limits A and B stand for the positions rA and rB. The substitution of the force F defined by dt d m v F into Eq.(1) leads to B A d dt d W A B m r v . Now dt dt dt d d v r r so that B A dt dt d W A B m v v
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 scalar (no direction): A negative W is energy removed from object.
