Forces (mc-01-ad-001) physics is applied to biological and physiological systems both at a macroscopic and at a microscopic level. The textbook provides reference to both; we study the effect of gravity on the otoliths in the macula of the inner ear and we study the effect of gravity on the entire human body. This is possible as the attached illustrates and many examples in the textbook rely on this approach. In the attached figure we consider the three forces t, Warm and f. which of the three forces in the figure is/are contact forces: all three forces, t and warm, t and f, warm and f. Answer key: c (mc-01-ad-002) physics is applied to biological and physiological systems both at a macroscopic and at a microscopic level. In the figure we consider the three forces t, warm and f. the dumbbell has a weight wdumbbell.