Draw the external forces on the bicycle that are required for the wheels to turn. Propose an experiment to measure the critical angle of an incline, above which a given object cannot roll without slip...Draw the external forces on the bicycle that are required for the wheels to turn. Propose an experiment to measure the critical angle of an incline, above which a given object cannot roll without slipping, and compare this to a model prediction. Propose an experiment to test the conservation of angular momentum of a rotating object. Propose an experiment to test whether an object with constant velocity can impart angular momentum to another object.