
Physics Physics Forum 
 LinkBack  Thread Tools  Display Modes 
March 17th, 2010, 08:17 PM  #1 
Member Joined: Jul 2009 Posts: 57 Thanks: 0  Finding the acceleration of two masses with gravity relati..
Title limit: Finding the acceleration of two masses with gravity relative to a fixed grid/orpoint. Funny, as soon as I go to post this, I see a post by dedanoe stating errors about newton's G. If he is right, I may already be at fault. But here is what I did to find the force between to masses, A (m_1) 8kg, B (m_2) 4kg, at a distance of 2m: Code: 6.67 x 10^11 m^3 G =  kg * s^2 m_1 * m_2 F = G *  r^2 m_1 = 8kg m_2 = 4kg r = 2m Thus: [6.67 x 10^11m^3] [8kg * 4kg] F = [] * [] [ kg * s^2 ] [ (2m)^2 ] = [6.67 x 10^11m^3] [ 32kg^2 ] F = [] * [] [ kg * s^2 ] [ 4m^2 ] = [2.13 x 10^9m^3 * kg^2] F = [] [ 4m^2 * kg * s^2 ] = [2.13 x 10^9m^3 * kg^2] F = [] [ 4m^2 * kg * s^2 ] = [5.33 x 10^10m^3 * kg^2] F = [] [ m^2 * kg * s^2 ] = [5.33 x 10^10m * kg]  [kg * m] [kg * m] F = []  1 N = 1 * [] 5.33 x 10^10 N = 0.000000000533 * [] [ s^2 ]  [ s^2 ], [ s^2 ] Thanks. 
March 18th, 2010, 06:41 PM  #2 
Member Joined: Jul 2009 Posts: 57 Thanks: 0  Re: Finding the acceleration of two masses with gravity relati..
Never mind. I was doing it wrong. Just found this: http://wwwistp.gsfc.nasa.gov/stargaze/Sgravity.htm Helped me out a bit. I was doing it separately. Being that F = ma, and G(m m2)/r^2 = F; m G(m2)/r^2 = ma = G(m2)/r^2 = a, ("a" usually as "g".) Which allowed me to find the earths acceleration to be ~9.81[...]m/s^2. Thanks. 

Tags 
acceleration, finding, gravity, masses, relati 
Search tags for this page 
Click on a term to search for related topics.

Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
static friction of masses connected by a rod  inkliing  Physics  0  December 17th, 2013 12:40 AM 
Acceleration Due to Gravity  micle  Physics  1  June 17th, 2013 11:17 PM 
Finding out applied force in order to get acceleration  DPXJube  Physics  1  January 28th, 2012 08:32 PM 
Two packing crates of masses 10 kg and 5 kg are connected  rsoy  Physics  2  December 11th, 2010 09:09 AM 
Food for the masses  JosephE  Algebra  2  November 28th, 2009 09:44 AM 