• Question 2: Use the concept of pressure to explain why snowshoes are better than regular shoes for walking in deep snow.
• Question 3:Why does the buoyant force always act upward? Think about the variation of pressure with depth. Remember that pressure in a fluid always acts at right angles to the surface. It’s OK to imagine a square block immersed in a liquid!
• Question 4: Has anyone seen CSI? If the criminalists of C.S.I. should find an unknown substance (you may / must assume the substance is pure) at the scene of a grisly murder, and they carefully measure the mass and volume, how can they identify the substance?

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