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A plumb line hangs straight down due to the force of gravity acting on the weight at its end. Gravity pulls the weight directly toward the center of the Earth, creating a vertical line. The tension in the string or cord ensures that it is taut, allowing the weight to align perfectly with the gravitational pull. This results in the plumb line always pointing straight down, indicating true vertical alignment.
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What does the plum line look like?
The plumb line is a vertical straight line.
How is a plumb bob used to check the vertical of a building under construction?
A plumb bob is a weight on the end of a string. It usually has a pointed lower end. It is hung adjacent to or in line with building elements to check whether they are "plumb" or "true to the vertical". A weight on a string holds the string under tension in a straight line down to the ground because of gravity. A person can move so they can see whether the straight line of the string lines up against the built element, to tell whether it is vertical.
Who invented the plumb line?
It is not known who invented the plumb-line or plumb-bob; there is evidence that it has been in use since biblical times and archaeologists haveÊunearthed what they think are plumb gaugingÊtoolsÊin Ancient Egypt.
What does a straight line up and down mean in math?
Vertical
What is a plumb line?
A plumb line is a weighted string which when hung from a fixed point and allowed to become motionless, indicates perpendicular to level. Perfect for aligning vertically that first piece of wallpaper.
