Splung.com Physics Forum Forum Index Splung.com Physics Forum
Discuss physics or ask questions. Part of the Splung.com physics web site.
 
   SearchSearch   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Question on Friction

 
Post new topic   Reply to topic    Splung.com Physics Forum Forum Index -> Physics Help. Ask a Physics Expert
View previous topic :: View next topic  
Author Message
honeybomb



Joined: 16 Oct 2013
Posts: 1
Location: United States

PostPosted: Wed Oct 16, 2013 1:50 am    Post subject: Question on Friction Reply with quote

Im learning about kinetic energy and potential energy. If I throw a ball up in e air, and there is friction present, the kinetic energy will decrease as the ball returns to the ground. What about at the top of the rise- will potential energy decrease because of the friction too? It confused me because potential energy is mass+gravity+height..... Can that be decreased based upon friction? Thanks.
Back to top
View user's profile Send private message
hepcj
Site Admin


Joined: 23 Jun 2007
Posts: 125

PostPosted: Wed Oct 23, 2013 12:31 am    Post subject: Reply with quote

First, consider the case where there is no friction. As the ball is thrown vertically into the air from the ground there is only kinetic energy. This changes to being totally potential energy at the top of the ball's trajectory.
The sum of kinetic energy + potential energy is the same throughout the flight of the ball. As one decreases the other increases.
That is for no friction. Air resistance will take away some of the kinetic energy of the ball as it travels and turn it into heat but at the top of the ball's flight path there will be no kinetic energy and just potential energy. The ball would not go as high because some of the energy has gone into heating up the ball and the surroundings.
Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic   Reply to topic    Splung.com Physics Forum Forum Index -> Physics Help. Ask a Physics Expert All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


© Copyright 2010 Splung.com