Question: Normal force N Force caused by impact abrasion cleaning andor installation work A dynamic load
Please fix the punctuation.
Fixed: [Normal force (N) Force caused by impact, abrasion, cleaning and/or installation work. A dynamic load.]

Question: 44th Free English online dictionary based on WordNet 30
Please fix the punctuation.
Fixed: [44th - Free English online dictionary based on WordNet 3.0]

Question: Flights within Peru 23000
Please fix the punctuation.
Fixed: [Flights within Peru 23,000 - -]

Question: At that time backlight was invented it was a pleasure to enjoy the world in its pouring rays The photographers eschewed the quotidian and the mundane and optimistically spread positive messages
Please fix the punctuation.
Fixed:
[At that time backlight was invented: it was a pleasure to enjoy the world in its pouring rays. The photographers eschewed the quotidian and the mundane and optimistically spread positive messages.]