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<< mono | monoda-2 >>

ものだ [ものだ] (monoda)
    Meaning: a thing that, the thing
    JLPT Level: 2
    Category: grammar
    Author: dc

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ex #797   だってクリスマスは家族が一緒になって祝うものだろう 
Because Christmas about [the thing of] family coming together to celebrate isn't it?  
ex #1202   会社はつぶれるものだ 
A company is a thing that can go bankrupt.  
ex #1215   人間の命ははかないものだ。 
It must be concluded that human life is but ephemeral.  
ex #5894   約束したら、きちんと守るものだ 
(It is common sense/Generally it is known that) When one has made a promise, one should keep it properly  
ex #6754   自分のことだけではなく、相手の立場に立って考えることのできる人、それが大人という ものです 
This is not something personal. Despite it is known this is for adults, there are people able to think about it with partners in a posed way.  

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AmatukaThis is an example where the English is forced - but the Japanese quite natural. It's difficult to get the nuance across. 
AmatukaSort of "To be a company is to be [at risk of going] bankrupt." 
AmatukaNot sure the example I've just added goes with the other one. まあ、いいだろう。 
blabbyHow about "Of course", "its obvious", "everyone knows", "naturally". I think it can be used to say that it is something that is always so. (一般的なこと) 
It shouldn't be translated as " a thing" since もの(thing) and ものだ are different, the latter is a grammar. 〜ものだ has different meanings and one of it is 〜が一般的な常識だ as what bladdy さん said. Translated as " It is known that..." , "It is common sense that ...." , "It is commonly known that...." , "It is generally known that...."
ex #1215 (As we know/As it is generally known), human life is but ephemeral 
ex #1202 " (Generally known), companies do have the possiblity of facing bankruptcy".
Where here I treat the sentence as 会社は潰れる + ものだ. But if you want to say " The company is a thing that can face bankruptcy" then you are treating it as 会社は+潰れるものだ which is a dfferent meaning.
So ex#1202 isn't a good example and I think can be safely removed. 〜ものだ usually used in advising or reminding someone of something of a common sense and a sense of "should"ness or obligation .
"It is common sense that (one should)...."
nayOh uhm.. no.
Please don't confuse this construction with an other use of mono da.(-> monoda-2)

While this one here is used to create a sentence structure which represents a characteristic of the subject instead of describing the actions taken or received by the subject (change of sentence pattern) the latter may be used to express something as common sense [it is (generally) known/common sense that ...(should)" (also an ideal or one’s conviction)] with an emotional nuance.

So actually I'd say that example #1202 is the one to show this grammars use most obviously. #5894, however, should be moved to "monoda-2".

But as mono da has so many meanings it's hard to differenciate. Though one..

Source: A Dict. of Intermediate Jap. Grammar, p.189;

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