When you calculate moments, you use the perpendicular distance between where the force is acting and the point you're calculating the moment from. Ay is a roller and can only provide a reaction purely in the y-direction, so the distance between Ay and point B in this case is the labelled distance between the roller and point B, 3m. The applied force, R, is acting through the centroid of the distributed load. For rectangular loads, the centroid is 1/2 the of the base, 5m in this case, which is 5/2 or 2.5m.
@@EngineersAcademy2020 ok so if we to draw our support reactions on a FBD diagram there is no fixed direction e.g. If it was a pin support we determine By and Bx in any direction you want ?
@@xxursolovelyxxXuse table 5-1 from the book, notice how the unknowns are an angle and a force. since the roller is not on an angled surface, there is only the force acting perpendicular to the surface, in this case, the vertical direction
Why is he reaction at support A upwards and not perpendicular or the contact plane (direction of motion)
Why did you use the 3m on the ground when you used the 2.5 meters on the bridge, it’s rxf and r isn’t on the ground?
When you calculate moments, you use the perpendicular distance between where the force is acting and the point you're calculating the moment from.
Ay is a roller and can only provide a reaction purely in the y-direction, so the distance between Ay and point B in this case is the labelled distance between the roller and point B, 3m.
The applied force, R, is acting through the centroid of the distributed load. For rectangular loads, the centroid is 1/2 the of the base, 5m in this case, which is 5/2 or 2.5m.
From Iraq, thank you 🇮🇶
The sum of the vertical components suggests that By is pulling down. That shouldn't be correct if the force on the beam is between the supports
You are the top
Why is By acting down not up
This is just initial assumption! The negative sign with answer will suggest that assumed direction is to be reversed
@@EngineersAcademy2020 ok so if we to draw our support reactions on a FBD diagram there is no fixed direction e.g.
If it was a pin support we determine By and Bx in any direction you want ?
@@karlydube1499 u can take start with any direction, negative sign will tell u the actual direction
@@EngineersAcademy2020 greatly appreciated 🙏🙏
Please upload more and we get to ask questions where we don’t understand
why sin(4/5 and cos(3/5)? I thought that sin is in vertical and cos in horizontal?
Sin is opposite, cos is adjacent
I wonder why there is no ax ?only ay?
Point "A" is a roller support
@@vincemarcselim2193 can you elaborate on why that makes there only be an Ay component?
@@xxursolovelyxxXuse table 5-1 from the book, notice how the unknowns are an angle and a force. since the roller is not on an angled surface, there is only the force acting perpendicular to the surface, in this case, the vertical direction
you are my goat
Thanks my goat student
wrong
nah ur goobed he is right