Archimedes Principle

DAILY LESSON PLAN. Subject: Class: Date: Time: No. of students: Learning Area : Learning Objective:

Physics Form 4 Science 1st June 2009 11.35 am – 12.05 pm (30 minutes) 34 students Forces and pressure Applying Archimedes Principle

Learning Outcomes:

At the end of the lesson, a student is able to: A

Master content knowledge a. Explain buoyant force of an object when it’s wholly or partially immersed in the fluid. b. Relate buoyant force to the weight of the fluid displaced. c. State Archimedes Principle.

B

Master Scientific Skills/TSTS a. Design and carry out an activity to investigate the relationship between the weight of water displaced and the buoyant force.

C

Demonstrate Scientific Attitudes and Noble Values a. Actively participate in carrying out the activity as a team. b. Be honest and accurate in recording data.

Scientific Concepts: Buoyant Force, a. An upward force resulting from an object being wholly or partially immersed in a fluid. Archimedes Principle, a. An object that is totally or partially submerged in a fluid experiences a buoyant force equal to the weight of fluid displaced. Materials, equipments and resource materials: Beaker 8 units Eureka Can 2 units Spring balance 1 unit Plasticine String Water Ping Pong ball 7 units Notes on PowerPoint slides Consideration of Safety Precautions: None Prior Knowledge: Students have already learned the operational definition of pressure, P = F/A, and understanding pressure in liquids, P = hρg.

Phase

Content

Introduction/ Eliciting Ideas (5 minutes)

Definition of pressure, P = F/A. Behavior of an object when it’s immersed in the liquid in terms of pressure and force.

Structuring/ Restructuring of Ideas (15 minutes)

Buoyant Force: a. An upward force resulting from an object being wholly or partially immersed in a fluid. Archimedes Principle: a. An object that is totally or partially immersed in a fluid experiences a buoyant force equal to the weight of fluid displaced.

Teaching and Learning Activities Teacher Activities Student Activities Make connection to Students respond students’ prior knowledge to teacher’s on pressure in liquids by questions. asking questions. Elicit students’ ideas about the force acting on the ping pong ball when it immerse in the water. Show beakers which filled with water and immerse the ping pang ball.

Students make observation and inference

Notes Strategy/Technique: Whole class Q&A

Strategy/Technique: Demonstration by teacher

Ask one central guiding question: What is buoyant force? Shows a Eureka can which filled with water and suspends the plasticine ball in the water. Let the water displaces into a beaker. Ask one central guiding question: What is the relationship between the buoyant force acting to the object b. with the weight of fluid c. displaces? d. Ask students for their hypotheses, the design of an activity to investigate the relationship, and the variables involved. Debriefing

Students make observation and inference

Students make hypotheses, give suggestions on the design of an activity and state all the variables involved. Then students carry out the activity to answer the central guiding questions. Students make conclusion

Strategy/Technique: Demonstration/ activity by students and guide by teacher

Application of Ideas (6 minutes)

1. Applications of

Reflection/ Closure (4 minutes)

Buoyant Force: a. An upward force resulting from an object being wholly or partially immersed in a fluid.

Archimedes Principle on submarines. 2. Application of Archimedes Principle on hot balloons.

Archimedes Principle: b. An object that is totally or partially immersed in a fluid experiences a buoyant force equal to the weight of fluid displaced. e.

Ask student to do a research and report on the application of Archimedes Principle.

Student search for the answer trough the text books and internet. Selected group will present their reports.

Strategy/ Techniques Group discussion followed by group presentation

Let students conclude by stating the main ideas and relating to students initial ideas Show summary of main ideas on slides Give reading assignment on Bernoulli’s Principle for next lesson

Students conclude the lesson by verbally stating the main ideas and relating to their initial ideas

Strategy/ Techniques: Whole class Q&A Resources: PP slides