Let's say I want to measure the weight of a bag of clothes (or some other object), in a situation where I don't have a weighing machine ("scales"?) available.
Objects that are available:
- A broom.
- The specialty of a broomstick is that its weight is evenly distributed.
- If the broom end cannot be removed, it means there is an extra weight on one end.
- A chair or something to balance the broom on.
- A counterweight with a known weight of, say, 1kg.
This could be a packaged food item, e.g. a milk package, placed in a plastic bag so it can be hanged on the stick.
- A pencil or some other thing to make marks on the broomstick.
- A smartphone with calculator.
Objects that might be available:
- A (wooden) stick with even distribution of weight, e.g. a broomstick with the broom end removed.
- A tape measure.
- A smartphone with internet and/or an app that does the math for me (if such an app exists).
- If you think you desperately need another object that is commonly available and does not radically change the setup of the scenario, you may include it in the answer.
None of these objects should be damaged in the process! E.g. we don't know if the owner of the broom would approve of removing the broom end.
I am looking for a method and a formula to determine the weight of the bag of clothes. So in other words, a primitive / improvised weighing machine / scales.
Note: The difference to traditional scales is that we don't have arbitrary counterweights available. It is hard enough to find one object with a known weight.
A perfect answer would have
- Simple and easy-to-follow instructions.
- Different versions of the instructions for the "optional" objects.
- Some background or proof or derivation of the formula, but separate from the instructions, so this part is optional for the reader.
P.S.: Yes, I might figure this out on my own if I think really hard. But even if I do, I still think this should go into a stackexchange Q/A. The best would be macgyver.stackexchange.com, but engineering is the closest fit.
About the "on hold" / "too broad".
I seriously don't get what is wrong with the question. It is a simple problem with a simple answer.
At the time of asking, I was sure that a weighing machine can be built with a stick balanced on something, and stuff hanging on the stick. I just was not sure about the exact setup (which is embarrassing, since this is very basic stuff), and which physical properties are required from the stick object. This is why I tried to provide details without narrowing it down unnecessarily.
The goal of this Q/A is that someone with the same problem finds the information that is relevant to the solution, so they learn how to build the thing and why it works.
I could have asked "How can I build an improvised weighing machine from commonly available household materials?", but this would be too vague because "commonly available household materials" is open to interpretation, and would possibly result in a wide range of different apparatuses.
On the other hand, it was clear that it does not matter if it is a broom or another stick-like object, so there was no benefit in insisting on this. Naming it a broom-stick makes it easier to imagine, so I kept it as part of the question.
And finally I was not sure if additional items are required for the task, so I left this open.