Part A: True or False. If false, explain why. 1. In general, heavy things sink and light things float. 2. Density is how big an object is. 3. Buoyancy is the force that pushes things under water. 4. When a body is floating it appears to lose some of its weight. 5. The pressure in a liquid depends only on its density. Part B. Open - ended Questions. 1. A piece of iron placed on a block of wood makes it float lower in the water, If the iron were instead suspended beneath the wood, would it float as low, lower, or higher? Defend your answer. 2. Will a swimmer gain or lose buoyant force as she swims deeper in the water? Or will her buoyant force remain the same at greater depths? 3. When you replace helium in a balloon with less dense hydrogen, does the buoyant force on the balloon change if the balloon remains the same size? Explain. 4. Why do airplanes normally take off facing the wind? 5. In the hydraulic arrangement shown, the larger piston has an area that is fifty times that of the smaller piston. The strong man hopes to exert enough force on the large piston to raise the 10 kg that rest on the small piston. Do you think he will be successful? Defend your answer.