Michael V wrote:Daniel & upriver,
F x d, Force x Distance, is a description of work being done. Though we may not be able to immediately identify the physical motions occurring, such that we can assign values to F and d via measurement, it does not change the reality of the process.
E= 1/2mv2, is not a measure of the energy an object possesses. It is a calculation of the work that object is potentially capable of applying, upon collision. There is no work done, no energy possessed or transferred without collision - work is the process of applying force through distance - energy is simply a calculation of an object's potential to do work based on its mass and velocity. An object with mass and motion could legitimately be said to possess momentum. Energy is a vastly misunderstood and misused concept, in that it is ONLY a CALCULATION of an objects potential for work.
Work is the transfer of energy...
The first law of thermodynamics states that when work is done to a system (and no other energy is subtracted in other ways), the system's energy state changes by the same amount of the work input. This equates work and energy. In the case of rigid bodies, Newton's laws can be used to derive a similar relationship called the work-energy theorem.
Again. My point is that you can transfer energy without distance.. Heat??
Work needs to be redefined to include cases where there is no distance but energy is still transferred!!