Pressure and Buoyant Forces

Introduction

Welcome Scholars of the Scientific Learning Community!

This Webquest will be your guide to learn vital information about Pressure and Bouyant Forces

Make sure you go over the tasks given to you, so you can prepare for several labs and activities requiring these concepts.

Task

Task 1: Vocabulary

 

Task 2: Pressure and depth activity

 

Task 3: Buoyancy Simulation

Process

Task 1: Find the definition for the following words at: https://www.britannica.com , https://en.wikipedia.org/wiki/Main_Page , http://hyperphysics.phy-astr.gsu.edu/hbase/pbuoy.html

- Force

- Fluid

- Pressure

- Atmospheric Pressure

- Buoyant Force

- Archimedes' Principle

Task 2: Pressure and depth activity

Density blocks and clear glass water. Observe block submerge, draw pressure arrows around block from the moment it is dropped at the surface and then as it goes down.  Relate to atmospheric pressure.

Task 3: Open the "Buoyancy Simulation" at : https://phet.colorado.edu/en/simulation/legacy/buoyancy

Initially, go to the intro part, make sure you turn on all the forces involved and change the block physical conditions. Place objects on the  balances. 

Then go to the buoyancy playground and change the mass, volume, and density of the object. Play with the changing conditions and write down observations.

 

Evaluation

Task 1: Students will have a vocabulary quiz at the end of the lesson.

Students are encouraged to used the words in their notes and class discussions.

 

Task 2: Will show this pressure demo video : 

Students must connect the information from the video to their observations from the activity.

 

Task 3: 

After the simulation, the following picture will be given to analyze. 

Image result for buoyant force on cubes image

 

The analysis will lead to the definition of Archimedes' Principle.

Conclusion

Task 1: Students will master the vocabulary for pressure and buoyant forces. 

Task 2: Between the main activity and evaluation, students will understand that the pressure exerted by a fluid increases as the depth of the fluid increases. The opposite happens for atmospheric pressure. Also. pressure acts different around the object. Students must be aware that pressure directly proportional to force applied on the object and inversely proportional to the area where the force is applied on the object.

Task 3: From the simulation, students will understand that the buoyant force is the result of increasing pressure at increasing depth. The picture where the 3 cubes with the same volume, but different densities will have the same buoyant force if they all displace the same volume. At that point density doesn't determine if cube will sink or float, but the buoyant force will. This concept will be important for the next lesson on sinking and floating.

Credits

Density picture came from presentation "Archimedes' principle" from SlidePlayer.com: https://slideplayer.com/slide/8456203/

Teacher Page

This web quest is part of a unit on density and buoyancy. Student should already know density and were given several opportunities to learn it in diverse ways. They will be given a quiz at the end of the previous lesson; this will tell me if they are ready or not. If not, they will be given remedial activities.

The web quest deals with pressure and buoyant force, which will help students understand the next lesson on sinking and floating.

In class, we should have worked pressure problems. Students will learn how pressure works in fluids through the activities shown in web quest. 

I will know know if my students learned from these activities by a quiz and participation in discussions regarding buoyant forces. I can give them different cases to discuss and see how much they have learned from the unit. Again, those who are behind, I will provide remedial activities, which they can work with those students that did understand within their group.

The following NGSS standards were used:

MS-PS2-2. Plan an investigation to provide evidence that the change in an object’s motion depends on the sum of the forces on the object and the mass of the object.

MS-PS2-5. Conduct an investigation and evaluate the experimental design to provide evidence that fields exist between objects exerting forces on each other even though the objects are not in contact.