Go Back   Physics Help Forum > High School and Pre-University Physics Help > Energy and Work

Energy and Work Energy and Work Physics Help Forum

Reply
 
LinkBack Thread Tools Display Modes
Old May 15th 2016, 10:30 AM   #1
Member
 
Join Date: Mar 2016
Location: Manchester
Posts: 37
Gravitational Potential Energy

I am having a little trouble visualizing what the gravitational potential looks like for a uniform gravitational potential field in a graph against distance.

I have attached the question below and completed the first graph but I'm not sure how to proceed with the second graph.

Any help would be much appreciated as always.
Attached Thumbnails
Gravitational Potential Energy-gravity_15.jpeg  
Clyner82 is offline   Reply With Quote
Old May 16th 2016, 06:03 AM   #2
Physics Team
 
ChipB's Avatar
 
Join Date: Jun 2010
Location: Morristown, NJ USA
Posts: 2,300
Since work = force times distance, and in a uniform gravitational field the force is mg, then the graph of PE will be linear, of the form PE = mgh.
ChipB is offline   Reply With Quote
Old May 16th 2016, 08:16 AM   #3
Member
 
Join Date: Mar 2016
Location: Manchester
Posts: 37
That makes sense now. I see that using ΔW = mΔV is good for non-uniform fields at higher distances whereas ΔPe = mgΔh works well for a close distance to the surface with uniform field (i.e. using g)

Thanks Chip
Clyner82 is offline   Reply With Quote
Old May 16th 2016, 01:03 PM   #4
Physics Team
 
ChipB's Avatar
 
Join Date: Jun 2010
Location: Morristown, NJ USA
Posts: 2,300
Originally Posted by Clyner82 View Post
That makes sense now. I see that using ΔW = mΔV is good for non-uniform fields ...
I'm not following you. In a gravitational field where force is equal to GMm/r^2, the change in PE is equal to GMm(1/r1 - 1/r2).
ChipB is offline   Reply With Quote
Reply

  Physics Help Forum > High School and Pre-University Physics Help > Energy and Work

Tags
energy, gravitational, potential



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Change in gravitational potential energy alongtheway Energy and Work 2 Apr 21st 2013 12:54 PM
gravitational potential energy TGS Energy and Work 1 Nov 19th 2009 08:34 AM
Gravitational potential energy arze Kinematics and Dynamics 4 Apr 19th 2009 06:05 PM
Gravitational Potential Energy baytom Advanced Mechanics 5 Feb 22nd 2009 07:59 PM
Gravitational Potential Energy rocket_man Advanced Mechanics 2 Jun 4th 2008 06:50 AM


Facebook Twitter Google+ RSS Feed