Lesson 3c Hydrostatic Forces

**Goals**. You can

- Explain pressure distribution. center-of-pressure (CP), buoyant force. (i.e. give knowledge described by MEAC).
- Explain the panel eqns (i.e. give knowledge in an Eqn. Summary Sheet).
- Apply the panel eqns (eq. 3.23 & 3.28) to predict forces and determine the CP
- Explain the buoyancy eqn. (i.e. give the knowledge in an Eqn. Summary Sheet).
- Apply the buoyancy eqn. (eq. 3.36) to predict buoyant force.

**Resources**

# Text, Chapter 3, sections 3.4, 3.6

**Plan** (steps to reach goal)

- Overview of hydrostatic forces via cool applications dams, airplane windows, float mechanism in a toilet, boats, natural convection, …. Working eqns.
- Pressure Versus Force. How to solidify concepts.
- Derivation of the hydrostatic force eqn. p-bar, area, … . Example problem.
- Derivation of the cp eqn. Example problem.
- Create a MEAC sheet for CP. Create/update MEAC sheet for pressure distribution.
- Text Problems 3.54, 3.57, 3.62
- Create an equation summary sheet for the Hydrostatic Eqn.
- Forces on curved surface; equation summary sheet for the buoyancy eqn.
- Concept problems on buoyancy. object in air; object floating in water; oil/water problem
- Create a MEAC sheet for Buoyancy.
- Text problems 3.80, 3.92, 3.96