CHAPTER 13 Assessment

Reviewing Content

Choose the letter that best answers the question or completes the statement.

1. A resting object exerts pressure equal to

   1. its mass times its contact area.

   2. its weight times its contact area.

   3. its mass divided by its contact area.

   4. its weight divided by its contact area.

2. Compared to the pressure exerted by a brick standing on its end, the pressure exerted by a brick resting on its side is

   1. the same.

   2. less.

   3. more.

   4. twice as much.

3. The amount of water pressure you experience while swimming in a pool depends on

   1. your buoyancy.

   2. the area of the pool.

   3. the volume of water in the pool.

   4. how deep you are in the water.

4. Which of the following is NOT true about the SI unit of pressure?

   1. It is used for fluids only.

   2. It is called a pascal.

   3. It is equal to one newton per square meter.

   4. It represents force per unit area.

5. Blaise Pascal discovered that changes in pressure

   1. are transmitted equally throughout a fluid.

   2. increase with depth of fluid.

   3. decrease with depth of fluid.

   4. depend on area.

6. In a hydraulic lift system, the output force is greater than the input force because

   1. a larger pressure acts on the output piston.

   2. a larger pressure acts on the input piston.

   3. the fluid pressure acts on areas of different sizes.

   4. of Bernoulli's principle.

7. Which of the following is NOT true about Bernoulli's principle?

   1. The pressure within a moving fluid is greater than the pressure within a nonmoving fluid.

   2. As a fluid's speed increases, the pressure within it decreases.

   3. When a moving fluid slows, the pressure within it increases.

   4. It helps explain the lift of an airplane.

8. The buoyant force acting on a submerged object

   1. the object's mass.

   2. the object's volume.

   3. the mass of the fluid displaced by the object.

   4. the weight of the fluid displaced by the object.

9. A partially submerged object floats when

   1. the object's weight is equal to the buoyant force.

   2. the object's mass is equal to the buoyant force.

   3. the object's weight is greater than the buoyant force.

   4. the buoyant force is downward.

10. A submarine changes depth by altering its

    1. speed.

    2. density.

    3. total area.

    4. shape.

Understanding Concepts

11. How is pressure different from force?

12. What are two characteristics of fluids?

13. State Archimedes' principle in your own words.

14. What two forces determine whether an object floats or sinks?

15. Why is it easier to float in salt water than in fresh water?

16. Why do helium-filled balloons rise in air?

17. Explain how a hydraulic lift operates.

18. Why is it easier to pull a submerged boat anchor to the surface than it is to lift it onto the boat?

19. Three different liquids and two equal-size cubes are placed in a beaker as shown. Which of the objects has the greater buoyant force acting on it?

    

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