How sensitive is a bridge camera?

I would like to know how sensitive a bridge camera really is. I'm not talking about dropping it from high ground, i guess this would be catastrophic but I'm talking about shakes and situations like having it in a backpack and running. I always have mine (Nikon P510) like a baby, I try not to scratch it, not to shake it or stuff like that.Is there any great risk for the lens to get misplaced or any "moving part" inside? I'm asking that because bridge cameras are not like compact and look more alike with a dslr(big and heavy). Any crash tests or something like that would be helpful so I can enjoy taking it with me with less fear of breaking it. Thanks
>>> How sensitive is a bridge camera?

How to make this! With the camera? I tried on my coolpix L120 and it didnt work!

Http://loldamn.com/a-cool-trick-for-your-starry-christmas.html
>>> How to make this! With the camera? I tried on my coolpix L120 and it didnt work!

Who knows much about cameras? Can I get an external view finder for a Nikon L810 camera?

I bought my gf a Nikon L810 for her birthday and she loves it but she has said it would have better with a view finder, I was wondering its possible to attach a view finder, I'm desperate to find out if its possible, I'm even use two question marks, any help would be appreciated :)
>>> Who knows much about cameras? Can I get an external view finder for a Nikon L810 camera?