Physics

posted by .

How is it possible for gravitational potential energy to be negative?
I Googled the answer, but all I could understand was that if the PE was zero at infinity as you move toward an object with gravity the KE must be positive because KE is the energy of motion so the the PE must be negative to equal a total of zero. Is this right? Or am I way off the mark?

  • Physics -

    PE is always to a reference. It is zero at infinity. But we commonly set some place (say ground level) and measure GPE in relation to that plane. Negative GPE means energy has to be given to get it back to zero. Example: refernce level is at 12 feet above ground. Below that, GPE is negative.

  • Physics -

    Okay, so using the ground level for your reference point if you went under the crust the GPE must be negative for the total energy to remain zero?
    I think I get it! Thanks a lot!

  • Physics -

    That is it.

  • fgox oilx -

    cbnewmzja kzjqtfg revk yqpinmhla bjenp vokjmn lfkmvpt

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physical Science

    If potential energy of an electron in ground state is -13.6 eV. The energy of next higher state is: a) -27.2 eV b) -6.8 eV c) -3.4 eV d) none of these please help me. Is it B?
  2. Physics 12

    What is the gtravitational potential energy of a 2.00e3 kg staellite that is in an orbit that has a radius of 9.90e6 m around the earth?
  3. physics

    ok i need help on this other question please A 56.0 kg skier is at the top of a slope. At the initial point A, the skier is 14.0 m vertically above the final point B. (a) find the difference in gravitational potential energy associated …
  4. Physics

    what is the gravitational potential energy at the centre of the earth?
  5. Physics

    what is the gravitational potential energy at the centre of the earth?
  6. physics

    A 0.720 kg snowball is fired from a cliff 8.10 m high. The snowball's initial velocity is 14.2 m/s, directed 30.0° above the horizontal. (a) How much work is done on the snowball by the gravitational force during its flight to the …
  7. Preap Physics!!

    Is gravitational potential energy different from potential energy?
  8. Science(Stuff to do like with magnets!)

    1. A positively charged test object is moving toward the positive source charge in an electric field. What happens next?
  9. physics

    A 20 kg object is acted on by a conservative force given by F = -3.0 x - 5.0 x 2, with F in newtons and x in meters. Take the potential energy associated with the force to be zero when the object is at x = 0. (a) What is the potential …
  10. science Please Help

    1. A positively charged test object is moving toward the positive source charge in an electric field. What happens next?

More Similar Questions