Believe it or not gravity is not really a force, it is an acceleration and on Earth it is about 32 feet/sec2. This same science principle applies in decelerating devices like parachutes and parafoils. The parachute decelerates or slows down the fall of the object.
What is a .DS_Store or ._ AppleDouble file? .DS_Store files are created by OS X to store metadata about folders and files including viewing options, icon positions and color labels. ._ AppleDouble files are created by the OS X when an application adds resource data or metadata to a file on a disk whose format doesn't support resources or metadata.
TEMP folder, as the name suggests, is used to store temporary files and folders which are created by Windows services and many 3rd party software programs. Since the files and folders stored in Temp folder are temporary, its absolutely safe to remove them. Now the question comes how to access this Temp folder to clear its content. First Temp folder which is found in C:\Windows\ directory is a system folder and is used by Windows to store temporary files. Second Temp folder is stored in %USERPROFILE%\AppData\Local\ directory in Windows Vista, 7 and 8 and in %USERPROFILE%\Local Settings\ directory in Windows XP and previous versions.