Every student has probably sat on a seesaw as a child and was not able to take off because of the difference in weight to the person opposite. In this chapter, the students deal with this topic, among other things, using a beam balance. They also carry out various experiments on the pulley block and the inclined plane. The acting force is determined with the force sensor M and the Mobile-CASSY 2 WLAN. The tripod set-up, which is always the same, makes it possible for the students to become familiar with the equipment in a short time and to concentrate fully on the physical phenomenon.