Work and Kinetic Energy

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Physics Newtonian Mechanics Work and Kinetic Energy

	Work done by a variable force: two –dimensional case:
	In two dimensions the force is having two components along x and y directions respectively. Then the work done by the variable force in two dimensions can be given as: Kinetic Energy and the Work-Energy Theorem: The work-energy theorem states that the net work done by a force exerted on an object is given as the change in kinetic energy. The kinetic energy of a particle of mass m moving with a velocity v is given by, Thus, the mathematical representation of work-energy theorem can be given by, where v_i and v_f are the initial and final velocities of the particle. In a more convenient manner the net work done can be written as: It can be noted that the work energy theorem is valid for both constant as well as variable force.