As piston P moves up in the direction shown, what happens to lever Q?

When piston P moves up, it exerts force on fluid contained in a closed system. This can cause a variety of reactions in the connected mechanisms, depending on the design and configuration of the system.

In this scenario, the upward movement of the piston does not translate to downward or lateral motion in lever Q. This is typically seen in systems where the piston and lever are part of a balance system or where their movements are not mechanically linked in such a manner that the piston’s action would cause the lever to move.

The design of the mechanics may also allow piston P's movement to occur without affecting lever Q directly—meaning they operate independently. Lever Q being stationary in this case indicates that it is either held in place or is unaffected by the vertical motion of piston P.

Understanding the mechanics involved here is crucial, particularly in hydraulics or any mechanical system where forces and motions need to be analyzed carefully.