mov files

I tried to put some mov files (quick time) tutorials, on my ipad and they wouldn't go on....yet, some other mov files did go on..can any one help with this?
thanks
Barb

MOV is a container, not a format.

Use a video conversion program like, say, Permute (just one of many examples) that will convert your non-compliant MOV file into an iPad-compliant MOV file.