Calculating Tension and Reaction Forces in an Overhead Garage Door System

AI Thread Summary
The discussion focuses on calculating the tension in cable AE and the reaction forces at the rollers in an overhead garage door system. The door, weighing 70 kg, is supported by a cable and two sets of frictionless rollers, with specific dimensions provided. A user suggests using the moment around point B to find the reaction at point A, followed by applying equilibrium equations for horizontal and vertical forces. The thread indicates a need for further assistance with the calculations, highlighting the complexity of the problem. The urgency for help is emphasized as the user expresses frustration over the lack of responses.
Jaspworld
Messages
4
Reaction score
0
A 70 kg overhead garage door consists of a uniform rectangular panel AC, 2100 mm high, supported by the cable AE attached at the middle of the upper edge of the door and by two sets of frictionless rollers A and B. Each set consists of 2 rollers located on either side of door. The rollers A are free to move in horizontal channels, while the rollers B are guided by vertical channels. If the door is held in the position for which BD =1050 mm, determine
a.) Tension in cable AE
b.) Reaction at each of the four channels

(For an image go to http://www.freewebsite.0nyx.com/images/garage.bmp Sorry for the crappy image. I made it in paint and by the way, that G is supposed to be W.)
 
Physics news on Phys.org
Any thoughts...?
 
I'm not too sure but..

I think I can calculate the moment around point B and then get the value for A. Then I can let Fx=0 and Fy=0 and get the rest of the answers.

Does this make sense?
 
Help

How come my thread ended up on the third page! I still need help..
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Solving 3D Statics Problem: Calculating Tension and Reactions
Replies
49
Views
9K
How Do You Calculate Tension and Reaction Forces in a Leaning Broom Problem?
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top