# Buoyancy Review and Practice

Review

1. What is buoyant force?                                                                                                                                                        A Buoyant force is a going up exerted by a fluid on any object placed on it.
2. Why does buoyant force occur?                                                                                                                                       A buoyant force accusers when occurs when an object’s weight is less than the buoyant force acting on it then the object floats.
3. Why is a heavier object more likely than a lighter object to sink instead of float in water?            The less fluid pressure there is the more heavy the object is which will cause it to sink unlike ones that have more fluid pressure they are able to float.
4. Assume you have an ice cube and also a small rock that is the same size and shape as the ice cube. Predict what would happen if you placed the ice cube and rock in a glass of water. Explain your prediction.                                                                                                                                                     I predict the rock will sink because it is really heavy and probably has no buoyancy at all and the ice cube  will float because it’s lighter and has more buoyancy.                                                                                                                                                                                                                                                                                                                                                                                                                Practice
1. What can a submarine do that a ship cannot?                                                                                         A submarine can go in side water and have nothing out of water. It can also let you see under water and breathe in the water because it is not on the surface of water but deep in the ocean. Also a boat can only float but a submarine can float and sink.
2. How does a submarine control its buoyancy?                                                                                              It has trim tanks that can be filled with air when needed and can be filled with water when needed