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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: P = Δt v as ΔW = Δt F ×Δs =F v = Δt Δs It is important to note that you can calculate the work done by an electrical appliance of power P in
The Work–Energy Theorem begins to answer that question by stating that a system gains or loses kinetic energy by transferring it through work between the environment (forces being POWER
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.
Review the units of work, energy, force, and distance. Use the equations for mechanical energy and work to show what is work and what is not. Make it clear why holding something off the ground or carrying something over a level surface is not work in the scientific sense.
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.
Chapter 6: Work, Energy and Power Tuesday February 10th Reading: up to page 88 in the text book (Ch. 6) •Finish Newton’s laws and circular motion •Energy • Work (definition) • Examples of work •Work and Kinetic Energy •Conservative and non-conservative forces •Work and Potential Energy •Conservation of Energy
Work-energy theorem: The net/total work done on an object is equal to the change in the object’s kinetic energy. In symbols: Wnet = ∆ EK. 2 Wnet = 2m(vf. - vi 2) Conservative force: The work done by the force in moving an object between 2 points is independent of the path taken ex. gravitational, electrostatic and elastic forces.
