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Net work is defined to be the sum of work done by all external forces—that is, net work is the work done by the net external force Fnet. In equation form, this is Wnet = Fnetdcosθ, where θ is the angle between the force vector and the displacement vector.
- 6.4: Work-Energy Theorem
The work W done by the net force on a particle equals the...
- 7.4: Work-Energy Theorem
Work-Energy Theorem argues the net work done on a particle...
- 6.4: Work-Energy Theorem
Work transfers energy from one place to another, or one form to another. The SI unit of work is the joule (J), the same unit as for energy.
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.
Work-Energy Theorem. The net work done on a particle equals the change in the particle’s kinetic energy: Wnet = KB −KA. W net = K B − K A. 7.9. Figure 7.11 Horse pulls are common events at state fairs.
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. Work Transfers Energy. What happens to the work done on a system? Energy is transferred into the system, but in what form? Does it remain in the system or move on? The answers depend on the situation.
The work W done by the net force on a particle equals the change in the particle’s kinetic energy KE: \(\mathrm{W=ΔKE=\frac{1}{2}mv_f^2−\frac{1}{2}mv_i^2}\). The work-energy theorem can be derived from Newton’s second law. Work transfers energy from one place to another or one form to another.
Work-Energy Theorem argues the net work done on a particle equals the change in the particle’s kinetic energy. According to this theorem, when an object slows down, its final kinetic energy is …
