Understanding Effect Of Forces

An Example of a Daily Lesson Plan using the 4-phase Teaching Model/Learning Cycle Subject: Class: Date: Time: No. of students: Learning Area : Learning Objective:

Physics Form 4 Genius 25 May 2009 10.30 am – 11.00 am (30 minutes) 28 students Forces and Motion Understanding the effects of a force

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

Master content knowledge a. Describe the effects of balanced forces acting on an object. b. Describe the effects of unbalanced forces acting on an object.

B

Master Scientific Skills/TSTS a. Predict what the forces acting when child playing a see saw. b. Observe with the situation given relate with the forces.

C

Demonstrate Scientific Attitudes and Noble Values a. Actively participate to answer teacher’s question b. Co-operation in the group during the activity c. Showing the interest in observing the video clips d. Being cooperative

Scientific Concepts: The effects of forces a. can change the size or shape of an object b. can move a stationary object c. can stop a moving object d. can change the direction of a moving object e. can accelerate or decelerate a moving object Materials, equipments and resource materials: Notes on Power Point slides Ruler Trolley Box Prior Knowledge: Students have already learned about a force.

Phase Introduction/ Eliciting Ideas (5 minutes)

Content Definition of force and the example of activities that require force. Definition of balanced forces and unbalanced forces.

Structuring/ Restructuring of Ideas (10 minutes)

Teaching and Learning Activities Teacher Activities Student Activities Make connection to Students students’ prior observe a video knowledge on forces by and respond to asking questions. teacher’s questions. Show the video clip about children playing see-saw. Elicit students’ ideas about the forces acting when children playing see-saw.

The effect of balanced forces acting on an object can cause the object : a) at rest b) moving at constant velocity

Shows a demonstration use to physics book when the forces on the book are balanced and unbalanced.

The effect of unbalanced forces acting on an object can cause the object: a) start or stop moving b) accelerating c) decelerating d) change its direction of motion e) change the size or shape of an object

What are the effects of balanced forces acting on an object?

Ask two central guiding question :

What are the effects of unbalanced forces acting on an object? Show a picture of bird perching on a branch of a tree. Show a video clip about golf buggy moving in a golf course with a constant velocity. Show a picture of toy car start to move

Students make prediction, inference, observation and conclusion

Notes Strategy/Technique: Whole class Q&A Resources : Video PP Slides

Strategy/Technique: Whole class Q&A Resources : PP Slides Video Graphics

forward in the road and stop the moving (demonstration use the trolley). Show a picture of cyclist uses a bigger force to pedal his bicycle and increased its speed. Show a picture of lorry moves from a smooth surface to a rough surface. Show a picture of tennis ball when is hit by a racket, the tennis ball change the direction. Show a demonstration to change a shape of ruler and a picture. Application of Ideas (10 minutes)

Differentiate the effect Shows a picture with a of balanced forces and different situation : unbalanced forces 1) Arm wrestling acting on an object. competition 2) Push the brakes down car 3) Tug of war Ask student discuss in a group refer to the situation given.

Reflection/ Closure (5 minutes)

The effects of a force is : a) Can change the size or shape of an object. b) Can move a stationary object

Students conclude by stating the main ideas and relating to students initial ideas. Show learning outcomes. Relate the topic to the

Students solve problems in groups Students present their solutions and compare with teacher’s answer

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

Strategy/Technique: Group Discussion Resources : PP Slides Worksheet

Strategy/Technique: Whole class Q&A Resources : PP Slides

c) Can stop a moving object d) Can change the direction of a moving object e) Can accelerate or decelerate a moving object

next topic. Give assignment: Reading a topic relationship between force, mass and acceleration for next lesson. For experiment 1) to investigate the relationship between force and acceleration when the mass is constant. 2) to investigate the acceleration and mass when the force is constant.