Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Large Mass But Low Kinetic Energy

  1. Feb 4, 2016 #1
    Can anyone please let me know an example where a body has large mass but low Kinetic Energy? Please provide some reasons for same.
     
  2. jcsd
  3. Feb 4, 2016 #2
    What exactly do you need it for? Then I may be able to help you better.
     
  4. Feb 4, 2016 #3
    I am in need of an example of a body having large mass but low kinetic energy? Please let me some reason for same - is an elephant moving uphill an example of same
     
  5. Feb 4, 2016 #4
    Going by the definition, KE=1/2*m*v^2
    Just consider a fully loaded truck moving slowly in a traffic jam.
    This meets the requirement for a heavy body and low KE. The only thing which is in our control is the velocity. So have as low a velocity as possible.
     
  6. Feb 4, 2016 #5

    A.T.

    User Avatar
    Science Advisor
    Gold Member

    How about a sleeping elephant?
     
  7. Feb 4, 2016 #6
    This case, though meets thecriteria, but is an extreme case.
     
  8. Feb 4, 2016 #7

    Dale

    Staff: Mentor

    How about a tectonic plate. 40E21 kg at 1.6E-9 m/s gives a KE of about 50 kJ, which is only enough energy to power a typical incandescent light bulb for about 20 minutes.
     
  9. Feb 4, 2016 #8

    A.T.

    User Avatar
    Science Advisor
    Gold Member

    Or how about any massive object in the rest frame of that object?
     
  10. Feb 4, 2016 #9

    Dale

    Staff: Mentor

    Yes I thought about that too, which would make it obviously 0.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook