View Single Post
  #1   Spotlight this post!  
Unread 27-10-2005, 23:53
sanddrag sanddrag is offline
On to my 16th year in FRC
FRC #0696 (Circuit Breakers)
Team Role: Teacher
 
Join Date: Jul 2002
Rookie Year: 2002
Location: Glendale, CA
Posts: 8,507
sanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond reputesanddrag has a reputation beyond repute
Finding smallest forces required to produce a given moment

I've been at this problem for a good while now and I'm still not coming up with the correct answer. I got the correct answer for part (a) but I'm not sure if I achieved it by proper means. Part (b) and (c) I'm not able to come up with the correct answer and I know I'm doing something wrong, I'm just not sure what. The correct answers are (a) 12 lb (b) 10.29 lb (c) 6.36 lb

I'm assuming it wants you to find what forces would make a couple (equal magnitude and opposite direction) so that the resulatant force is zero so the object does not translate, but it rotates. Is this correct?

Yes this is a homework problem but I'm looking more to gain an understanding of how to do it more than the points for doing it. I could just move on to the next problem but I'd rather get an understanding of it so I am sure that I'm attacking the next problems the right way. Please understand I'm not trying to freeload an answer off the wise people on these forums. I'm trying to correct my problem solving methods so one day when I design the car you're driving in, its suspension arm doesn't snap and cause the car to crash and injure you. So please, help me solve this correctly so I don't make a future mistake where it really matters.

This seems like something that should be very simple and I think I'm just missing one little something in solving this problem.

Any help is appreciated and as always sooner is better than later. Thanks in advance.

EDIT: Yes, this is statics.
Attached Thumbnails
Click image for larger version

Name:	IMG_0101b.jpg
Views:	125
Size:	78.5 KB
ID:	3641  
__________________
Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004

Last edited by sanddrag : 28-10-2005 at 00:37.
Reply With Quote