Begin the lesson by introducing the concept of non-contact forces using magnets as an example. Discuss how magnets can move objects without touching them, setting the stage for understanding magnetic force.
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Non-contact Forces – Magnetic Force
Learning Objectives
- Understand the concept of non-contact forces using magnets as an example.
- Demonstrate how magnetic force can arrange materials like iron filings without direct contact.
- Identify the poles of a magnet and explain how like and unlike poles interact.
- Explore practical applications of magnets in everyday life, such as in maglev trains and medical imaging.
- Differentiate between materials that are attracted by magnets and those that are not.
Introduction and Hook
Engage students with a demonstration of magnetic force using a magnet and iron filings to visualize the magnetic field lines.
Direct Instruction
Explain the properties of magnets, including the concepts of magnetic poles and how like poles repel while opposite poles attract.
Use the video 'Poles of a Magnet' to illustrate the interactions between the poles of bar magnets. This video helps clarify how non-contact forces operate at a distance.
Guided Exploration
Facilitate an exploration of materials that are attracted by magnets and those that are not. Encourage students to predict and test various objects.
Watch the video 'Is it magnetic or non-magnetic?' to support students' understanding of magnetic and non-magnetic materials through hands-on demonstrations.
Hands-On Activity
Conduct a hands-on activity where students use magnets to move iron filings on paper, observing the patterns formed by magnetic fields.
Use the video 'Making a Magnet Using the Stroke Method' to demonstrate how to magnetize a metal object, reinforcing the concept of magnetic force.
Independent Practice
Assign students the task of identifying and categorizing objects in their environment as magnetic or non-magnetic.
Encourage students to explore the practical applications of magnets in everyday life, such as in maglev trains and medical imaging.
Check for Understanding
Engage students in a discussion to assess their understanding of magnetic force and its applications.
Use the assessment 'Can a Magnetic Force Act at a Distance?' to evaluate students' comprehension of non-contact forces.
Review and Reflection
Review the key concepts of magnetic force, poles, and practical applications with the class.
Encourage students to reflect on what they have learned about non-contact forces and how they can observe these forces in their daily lives.
Assessment and Extension
Administer the 'Contact and Non-contact Forces' assessment to test students' understanding of the differences between these forces.
Encourage students to explore further by researching other non-contact forces such as gravity and electrical force.
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