Let me explain extremely simple. ぶったい（物体）- object､ もの -thing. Like English language has two layers, German-originated words and Latin-French-originate words, Japanese has Japanese-originated and Chinese originated words. ぶったい, it's a Chiinese､もの, it's an original Japanese. もの is 'thing visible', and ’こと', thing invisible, concept, or thoght. ’こと' is a Japanese Japanese. ものごと is a Japanese Japanese,　じぶつ is a Chinese Japanese. >ぶったい indicates a mysterious or unknown object.ものごと can be anything (even non-physical >objects) and it indicates a plurality of things, right? Is my understanding correct?　 ものごと cannot be physical. Which has broader meaning and usage, 'object' and 'thing'. I believe it's 'thing'. For example, maybe you can say 'The thing is ....' or 'The main thing is ' , but not 'The object is....'. Same thing happen in 'ぶったい（物体）' and 'もの’　　e.g, やるもんだね～（＝やるものだね～）　means 'you do it great!'. I think the word '事物' is only used in old philosophical writing or translation. e.g, " 事物を根底において理解せんと欲するとき…" 'ものごと' can be used in daily conversation. e.g, '物事そう簡単にはいかないさ' Feel free to ask question. P.S: 'もの'　is very important for understanding Japanse language. It's a big issue.

Your understating about ぶったい、もの、ものごと is basically correct. However, to me, ものごと can be もの and/or こと so it could be a single physical object (もの) and/or a non-physical object such a concept, thought, property, etc (こと). じぶつ (事物); we rarely use this in conversation. My dictionary says ものごと (物事) focuses on もの while じぶつ focuses on こと. However, I do not prioritize もの and/or こと in ものごと. I believe that It's just what we commonly say. When I hear じぶつ instead of ものごと in conversation, I may not understand what that word is. So, I do not think of example sentences with it.