My work as an together at power plants to generate electricity. Today we’ll see how work and workenergy that is brought out by examining the units by which they are measured.share an interesting relationship Last time we used de Coriolis’ formula to compute work to calculate the amount of Newton • meters of . That relationship is shown here,work
The .energyWe’ll start by supposing that you’re unfamiliar with the Newton as a unit of measurement. In that case you’d have to employ longhand notation to quantify things, which means you’d be measuring units of force in terms of Putting equation (1) in longhand notation terms, we arrive at,
3 meters (2)
If you’ve been following along in this blog series, you’ll recognize that the unit of measurement used to compute kilogram • meters, is the same as was used previously to measure ^{2} per second^{2}energy. That unit is the Joule, which is considerably less wordy. Equations (2) and (3) bear out the and workthey share the same unit of measure. This relationship would not be apparent if we only considered the units for energy — presented in equation (1).work So following standard engineering convention where are expressed in the same units, the energy required to push the wheelbarrow is expressed as,work
Yes, are measured by the same unit, the energyJoule. But, isn’t the same as energy. work is distinguished from Energy in that it’s the workmeasure of the ability to perform . Stated another way, work cannot be performed unless there is work available to do it, just as when you eat it provides more than mere pleasure, it provides your body with the energy required to perform the energyof pushing a wheelbarrow through the garden.work Next time we’ll see how Work Energy Theorem, which mathematically relates to work.energyCopyright 2015 – Philip J. O’Keefe, PE Engineering Expert Witness Blog ____________________________________ |