Science Buddies: "Ask an Expert"

what are the 2 main forces involved in pratt bridge

This is an excellent example of a question that can be answered using a simple Google query. Entering "Pratt truss forces" into Google results in several useful links that contain the information you're looking for. One thing to note if this is for a report that requires research... usually sites like Wikipedia can give you the answer you're looking for, but aren't suitable for citing in your research. They can be excellent places to start looking for "primary" sources (such as journal articles, books, etc.), however.

umm i need help on a project but i dont no wat to write about.........

Hi!
Please be more specific when asking questions to the Experts. It is extremely hard for us to help you if we are not sure what project you are doing. Let us know, and we would be happy to help!