Pls helppp Safia and Priya investigate friction. Here is the equipment they use. They pull the wooden block with a forcemeter. They repeat the investigation using different materials. (a) What two measurements should they make?​

A200-n force is applied to the foot-operated air pump. the return spring s exerts a 2.6-n·m moment on member oba for this position. determine the corresponding compression force c in the cylinder bd. if the diameter of the piston in the cylinder is 40 mm, estimate the air pressure generated for these conditions. state any assumptions. enter a positive number for the compression force c.