1. The problem statement, all variables and given/known data I want a box shaped robot to move on the ceiling. The robot sticks to the ceiling using magnets. I am attaching a picture. The red is a magnet. How do I calculate how much force is needed to move the robot horizontally? I know very little physics and I need to figure out how strong my motors need to be. 2. Relevant equations This is the kind of magnet i will be using http://www.magnet4less.com/product_info.php?products_id=826 3. The attempt at a solution This is not actually a homework problem. Its for a robotics project.