1. An Overview Work Potential & Kinetic Energy Energy Sources Petroleum Coal Water Nuclear Solar Wind Geo-thermal

14. Work To understand WORK – we must understand force Force An interaction between objects that is capable of changing the objects state of motion (rest/moving) F=ma

15. Force Work Power Energy F=ma m=F/a a=F/m

16. Work (Mechanical) A function of force and distance Application of a force to an object and the distance the object moves W = F x d Unit of measurement – foot pound (ft lb)

17. Force Work Power Energy F=ma W=Fd

18. Important criteria for Work: 1. Something must move 2. Movement must be in the same direction as the direction of the force Push, pull, lift, etc. 3. Time is not a function of work

19. Power Defined as the amount of work done over a period of time. Force, distance, & time Decrease the time – increase the power Horsepower 550 ft lb/s

20. Force Work Power Energy F=ma W=Fd P=W/t

21. Energy Defined as the ability to do work Potential energy Energy at rest Fig 3.6 (p. 67) Kinetic Energy Energy in motion Defined in terms of Work done to put the object in motion Work done on coming to rest