Questions about Physics

You have an inclined treadmill with a cylinder. How do you need to control the treadmill so that the cylinder doesn't fall? If you adjust the treadmill's inclination, how does the treadmill speed control need to be changed? Given a treadmill's limited speed range and assuming that the treadmill can be inclined within a certain range both positively and negatively, how would you control the treadmill to launch the cylinder as far as possible.

A woman holds a box by gripping two adjacent faces. How much pressure does she have to exert on the box to keep it from falling?