Physics Help Forum What happens to your weight
 User Name Remember Me? Password

 General Physics General Physics Help Forum

 Jul 2nd 2014, 02:00 AM #1 Junior Member   Join Date: Jun 2014 Posts: 15 What happens to your weight Need help to understand Physics basic concepts Suppose a planet is shrinking to is one-tenth of its original diameter without change in its mass and you are standing on the surface of that planet. What happens to your weight? it would be more or less? Thanks
 Jul 2nd 2014, 04:38 AM #2 Physics Team     Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,352 If you apply Newton's Law of Gravity you should be able to see what happens: F=GMm/r^2 where G is the gravitational constant, M the mass of the planet, m is your mass, and r is the distance between the two center of masses (effectively the radius of the planet). In your scenario G, M, and m are all constant, but r becomes r/10. So what happens to the force of gravity acting on you (i.e., your "weight")?
Jul 3rd 2014, 02:15 AM   #3
Junior Member

Join Date: Jun 2014
Posts: 15
 Originally Posted by ChipB If you apply Newton's Law of Gravity you should be able to see what happens: F=GMm/r^2 where G is the gravitational constant, M the mass of the planet, m is your mass, and r is the distance between the two center of masses (effectively the radius of the planet). In your scenario G, M, and m are all constant, but r becomes r/10. So what happens to the force of gravity acting on you (i.e., your "weight")?
Thank you so much for your nice and simple explanation!!!

 Tags weight

 Thread Tools Display Modes Linear Mode

 Similar Physics Forum Discussions Thread Thread Starter Forum Replies Last Post leonid2011 Kinematics and Dynamics 3 Feb 14th 2011 06:44 PM Jg596 Kinematics and Dynamics 1 Mar 22nd 2009 07:35 PM mitnord Thermodynamics and Fluid Mechanics 1 Mar 10th 2009 10:41 AM mrpedantic Kinematics and Dynamics 2 Jan 24th 2009 05:11 PM rachana sisodia Kinematics and Dynamics 5 Nov 23rd 2008 04:34 AM