WORK

1. WORK • Work provides a means of determining the motion of an object when the force applied to it is known as a function of position.

2. Work Energy Theorem • Wnet is the work done by • Fnet the net force acting on a body.

3. Work Energy Theorem (continued)

4. Work Energy Theorem (continued)

5. Work Energy Theorem (concluded) • Define Kinetic Energy • Then, • Wnet = Kf - Ki • Wnet = DK

6. WORK - GENERAL DEFINITION

7. CONSERVATIVE FORCES • A force is conservative if the work it does on a particle that moves through a closed path is zero, otherwise, the force is nonconservative.

8. CONSERVATIVE FORCES (cont) • A force is conservative if the work it does on a particle that moves between two points is the same for all paths connecting those points, otherwise, the force in nonconservative

9. Potential Energy • DU = - Wc • Wnet = DK • IfWnet = Wc • Then, DK = - DU • DK + DU = 0 • D(K + U) = 0

10. MECHANICAL ENERGY • U + K = E • E = Mechanical Energy • DE = 0 • Ei= Ef • Ki + Ui = Kf + Uf

11. Mass and Spring