This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Vertical forces. Transferred from org el transferred to Commons by User MARKELLOS using de php CommonsHelper br Original text br first version last version Original uploader was at org el PDAUTHOR diagram el Original upload log page el CE CE CE BA CE
Page 2023 Free-images.com. All images are Public Domain