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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.
Work-Energy Theorem: (a special case of the law of conservation of energy) The change in kinetic energy of a system equals the sum of work done by all the individual forces on the system: ∆K = ∑W Strictly speaking this theorem applies to rigid ("non-squishy") objects KJF §10.3
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.
Kinetic Energy and the Work-Energy Theorem. Explain work as a transfer of energy and net work as the work done by the net force. Explain and apply the work-energy theorem. 7.3. Gravitational Potential Energy. Explain gravitational potential energy in terms of work done against gravity.
This video explains the work energy theorem and discusses how work done on an object increases the object’s KE.
Work is done - for example, when an object is squashed, kinetic energy is converted into elastic potential energy. Energy is emitted or absorbed in the form of electromagnetic radiation - for example, when thermal/internal energy of a radiator is transmitted by infrared radiation.
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.
