12.3 Questions and Vocabulary

1.  Pressure is ______

2.  2. Give an example of pressure ______

3.  If force increases, what happens to pressure? ______

4.  What unit is used for Pressure? ______

5.  What is the result of collisions of particles with an object? ______

6.  In which direction does pressure act on an object in a fluid? ______

7.  How does understanding particle motion help you understand fluid pressure? ______

8.  Look at the picture on page 397: How are the water molecules exerting pressure on the diver? ______

9.  Will the pressure at the top of a mountain be greater than one atmosphere or less than one atmosphere? ______

10.  Why is water pressure greater than air pressure? ______

11.  How is pressure related to force and surface area? ______

12.  Describe the way in which a fluid exerts pressure on an object immersed in it ______

13.  How does changing elevation affect air pressure? How does changing depth affect water pressure? ______

14.  What might cause a balloon blown up at a low altitude to burst if it is taken to a higher altitude? ______

15.  During cold winters, ice can form on small lakes and ponds. Many people enjoy skating on the ice. Occasionally, a person skates on thin ice and breaks through it. Why do rescue workers lie flat on the ice instead of walking upright when reaching out to help rescue a skater? ______

16.  Draw an equation triangle for pressure below this space.

17.  Using the equation triangle for pressure, answer the following questions. Make sure to write out the formula you are using, identify your variables, substitute into the equation and solve, including units!

  1. If a winter hiker weighing 500 N is wearing boots that have an area of 0.075 m², how much pressure is exerted on the snow?
  1. A pressure of 200 Pa is exerted on a surface with an area of 20 m². What is the total force exerted on the surface?
  1. A box with a weight of 25 N is placed on a brick with an area of 0.12m². How much pressure does the box exert on the brick?
  1. What force is exerted on 14 m² if the pressure is 300 Pa?
  1. A force of 500 N produces a pressure of 125 Pa. Over what area is the force applied?

17. Using the equation triangle for pressure, answer the following questions. Make sure to write out the formula you are using, identify your variables, substitute into the equation and solve, including units!

  1. If a winter hiker weighing 500 N is wearing boots that have an area of 0.075 m², how much pressure is exerted on the snow?
  1. A pressure of 200 Pa is exerted on a surface with an area of 20 m². What is the total force exerted on the surface?
  1. A box with a weight of 25 N is placed on a brick with an area of 0.12m². How much pressure does the box exert on the brick?
  1. What force is exerted on 14 m² if the pressure is 300 Pa?
  1. A force of 500 N produces a pressure of 125 Pa. Over what area is the force applied?