WorkEnergy WorkEnergy Theorem Conservation of Kinetic Energy WorkEnergy
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Work/Energy Work-Energy Theorem Conservation of Kinetic Energy Work-Energy Theorem Work-Energy Diagram 1
Work/Energy Work-Energy Theorem Conservation of Kinetic Energy If no work is done on an object, its kinetic energy does not change. THIS IS ONLY TRUE WHEN THERE IS NO WORK BEING DONE! Total work equals zero only if… 2 1. There is no net force on the object or. . . 2. The net force and infinitesimal displacement are perpendicular to each other.
Work/Energy Work-Energy Theorem Examples of Conservation of Kinetic Energy THIS IS ONLY TRUE WHEN THERE IS NO WORK BEING DONE! Total work equals zero only if… 3 1. There is no net force on the object or … 2. The net force and infinitesimal displacement are perpendicular to each other.
Work/Energy Work-Energy Theorem Work- Energy Theorem If there is work done on an object, then the change in kinetic energy is equal to the work done. 4
Work/Energy Work-Energy Theorem Work and Energy 5 Work and energy are calculated from simple equations
Work/Energy Work-Energy Theorem Work- Energy Theorem 6
Work/Energy Work-Energy Theorem Work-Energy Diagrams Work K initial The work is equal to the change in the kinetic energy of the system K final 0. 5 J 2 J 1. 5 J Kinetic Energy Total Work 7
Work/Energy Work-Energy Theorem Work- Energy Theorem In terms of potential energy, we have 8
Work/Energy Work-Energy Theorem Including Potential Energy Work-Energy Theorem 9 The total work done on a systems is ALWAYS equal to the change in its kinetic energy
Work/Energy Work-Energy Theorem Work-Energy Diagrams Work K initial U initial 0. 5 J Total Energy The nonconservative work is equal to the change in the total energy of the system 1. 0 J 1. 5 J K final U final 2. 0 J -1. 0 J -0. 5 J Initial Final Kinetic Energy Potential Energy Total Energy 10 Nonconservative Work