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How do you calculate joules necessary to rotate an object?

  1. Jan 10, 2016 #1

    I merely wish to know how to calculate the force necessary to rotate an object, say of 10 kg, from a certain downward diagonal direction of 45 degrees into an upright position considering only gravity.

    I'll need to use some formula involving torque...
  2. jcsd
  3. Jan 10, 2016 #2


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    Your post is not clear.

    In the title, it says you want to calculate joules necessary to rotate an object. In the OP, it says you want to calculate the force necessary.

    Joules are the units of energy or work. Force is measured in units of newtons.

    What do you want to know?
  4. Jan 10, 2016 #3
    My bad. I've read the distinction between the two, but must have slipped.:rolleyes:
    I want to know the energy, and so need to provide the dimension of the object: let's say it's 1 meter long.

    I'm just making its characteristics up because I want to know the general approach that's necessary.

    I'm thinking that I'll have to integrate sin all across its rotation to account for the normal force? Let's say the object starts at a diagonal downward position of 45 degrees.
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