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Work and Energy Unit Joule

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  1. Feb 4, 2016 #1
    Work unit is said to be Joule and Energy unit is also Joule. Work formulas in F x S ( Force x Displacement) .
    We know
    1 J = 1 F x `1 s
    Now Energy is also measured in Joule(J)
    So can we state :
    E = 1 F x 1 s as 1 J = 1 F x 1 s
    that is
    E = W

    Then why work and energy are different by definition and meaning
     
  2. jcsd
  3. Feb 4, 2016 #2

    QuantumQuest

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    A small glitch, 1J = 1N x 1s.

    What do you mean by that? A very "rough" statement back from high school times, is "Energy of a body, is the ability to do work". Now, what are the definitions you refer to?
     
  4. Feb 4, 2016 #3
    I am not sure if you mean to correct a glitch or to present one. :)
    The Joule is not Nxs (Newton times second).

    The OP meant Force x distance when he/she wrote 1J= 1F x 1s (by s probably meaning distance, displacement).
     
  5. Feb 4, 2016 #4
    Well is W = E ? I am not going by definition but rather its unit of measurement which in this case is Joule (for both Work & Energy)? So why we state that work is said to be done when a is force applied on a body and it displaces while energy is ability or capacity to do work - why are the unit of measurement same for both work / energy - JOULE?
     
  6. Feb 4, 2016 #5

    Svein

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    Because work and energy is two sides of the same coin. If you lift a boulder (10kg) up 1m, it means that:
    • You have performed an amount of work = m⋅g⋅h = 10⋅9.81⋅1J = 98J
    • The boulder has gained an amount of potential energy = m⋅g⋅h = 10⋅9.81⋅1J = 98J
     
  7. Feb 4, 2016 #6

    QuantumQuest

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    Yes, sorry for the typo, I meant N x m - of course, in SI units.

    Work expresses energy transmission or transformation of energy, from one form to another. So, they have the same unit of measurement.
    As for the energy concept itself, I recommend this great insight by DaleSpam https://www.physicsforums.com/insights/what-is-energy/.
     
    Last edited: Feb 4, 2016
  8. Feb 4, 2016 #7

    ZapperZ

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    2016 Award

    Work is a form of energy
    Potential energy is a form of energy
    Kinetic energy is a form of energy

    They ALL have the same dimension and SI units.

    The similar way as

    Electrostatic force is a form of force
    Gravitational force is a form of force
    Spring force is a form of force
    Tension is a form of force
    Frictional force is a form of force

    They all have have the same dimension and SI units of N.

    Zz.
     
  9. Feb 5, 2016 #8
    Work expresses energy transmission or transformation of energy - got it thanks
     
  10. Feb 5, 2016 #9
    Thanks for the details
     
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