h 2. Work as a dot product The work done by a force F can be written as W=F s (1)If Fls, the work done by the F is zero (2 )Unlike mass and volume, work is not an intrinsic property of a body. It is related to the external force (3 Unit of work: Newton-meter ( Joule) (4)The value of the work depends on the inertia/ reference frame of the observer ch 11 Energy I: Work and kinetic energyCh.11 Energy I: Work and kinetic energy 2. Work as a dot product The work done by a force can be written as (11-2) (1) If , the work done by the is zero. (2) Unlike mass and volume, work is not an intrinsic property of a body. It is related to the external force. (3) Unit of work: Newton-meter (Joule) (4) The value of the work depends on the inertial reference frame of the observer. → F W F s → → =  → → F ⊥ s → F → m g s  h v