
#1
Nov1108, 04:04 PM

P: 16

what about the gravitational potential energy of a system?
1. The problem statement, all variables and given/known data NA [b]2. Relevant equations NA 



#2
Nov1108, 04:13 PM

P: 16

Nope. Think of the formula for KE. Mass is never negative, and even if the velocity is negative, its squared so the negative sign goes away.
Gravitational Potential can be negative depending on where you define your potential to be zero. But really, only changes in potential energy are relevant. Its only when the gravitational potential energy changes that the KE changes, a force is exerted, etc. 


Register to reply 
Related Discussions  
Kinetic Energy on Pulley/Incline System  Introductory Physics Homework  9  
Pulley System Kinetic Energy  Introductory Physics Homework  9  
negative kinetic energy?  Quantum Physics  7  
negative kinetic energy in tunneling  Quantum Physics  5  
Negative Kinetic Energy???  Quantum Physics  13 