Satellite revolving around moon and earth. Point masses. Rotating coordinate system, where earth and moon are on fixed position.
A basin filled with water. The block on the right hand side is movable. The water pushes the block rightwards. In the beginning, however, the block stands still due to static friction. An amount of water is falling into the basin. This increases the force from the water to the block. The block starts moving. Dynamic friction applies as the block moves rightwards.