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

Homework Help: Gravity stuff

  1. Oct 29, 2005 #1

    UnD

    User Avatar

    Hey i was wondering
    i need to perform 2 experients (i can't do the penulum one) using completely different methods to measure the acceleration due to gravity.

    I thought of the droping different masses and using the ticky tape timer, ?

    Also where will i be able to find these things for the planets in our solar system,
    planet radius, acceleration due to gravity at surface, orital radius, orbital period, length of planet, orbital radius of a geostationary satellite and escape velocity.

    Thanks
     
  2. jcsd
  3. Oct 29, 2005 #2

    Chi Meson

    User Avatar
    Science Advisor
    Homework Helper

    yes, a ticker-tape timer would work fine.

    http://pds.jpl.nasa.gov/planets/welcome.htm
    look under "Planet Profiles"
     
  4. Oct 29, 2005 #3

    UnD

    User Avatar

    Cool. Thanks i need to find another that is different.
    Plz help. thanks
     
  5. Oct 29, 2005 #4

    Chi Meson

    User Avatar
    Science Advisor
    Homework Helper

    Consider the energy approach, you know, PE at top = KE at bottom; mgh = (1/2)mv^2 .
     
    Last edited: Oct 29, 2005
  6. Oct 29, 2005 #5
    Whta is the formula for the force of friction of an inclined plane?
     
  7. Oct 30, 2005 #6

    UnD

    User Avatar

    Hmm, Chi Meson, How will i perform the experiment?
    nguyen713, i kind of see what you are getting at, I have forgoten the formula i'll try and look around here.
     
  8. Oct 30, 2005 #7

    Chi Meson

    User Avatar
    Science Advisor
    Homework Helper

    According to the law of conservation of energy, the KE of a low-friction cart at the bottom of the incline is about equal to the PE of the (motionless) cart at the top. speed can be measured, height can be measured, g can be calculated.

    I've led you to the door on this one, you have to go in by yourself.
     
  9. Nov 2, 2005 #8

    UnD

    User Avatar

    Oh k, Cool thanks.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook