http://www.ck12.org Chapter 15. Fluid Forces
Lesson Review Questions
Recall
- Define pressure.
- What is the SI unit for pressure?
- Identify two factors that affect the pressure of fluids.
- Describe how pressure changes with depth in fluids.
Apply Concepts
- Apply Pascal’s law to explain why squeezing one end of a toothpaste tube causes toothpaste to squirt out the
other end. - A box weighing 200 N is resting on the ground on an area of 1 m^2. How much pressure is the box exerting on
the ground?
Think Critically
- Explain why fluids exert pressure.
- Relate Bernoulli’s law to lift in an airplane.
Points to Consider
If you’ve ever floated in water, you may have noticed that filling your lungs with air helps to keep you afloat.
- Why do you think having more air in your lungs helps you float in water?
- What other things float in water? What things don’t float? How do they differ?