Magnetic Force

By Fengfeng Zhou •

Grade Level	12th
Subject Area	Physics
Duration	1.5 hours
Setting	Lab
Background Knowledge	Force equilibrium and vector decomposition
Author	Fengfeng Zhou

Summary
Lecture is delivered in the format of PowerPoint slides. This lesson is the key of a module including three lessons. Students will engage in two attracting activities: one is to measure magnetic force and verify the formula F = IBL, the other is to construct an electric motor. The first activity is quite challenging and can be easily modified to become more challenging. Students will get a taste of doing authentic scientific research through this activity.

Objectives
Students will: Understand that a magnetic field will exert a force on any current and that this is the most important property of a magnetic field. Be able to use the third right-hand rule and the formula F=IBL to solve relevant problems. Understand the nature of magnetic force and be able to determine the force exerted on an electric charge in a magnetic field. Understand the principle and operation of an electric motor.

Ohio Standards
Science Design and carry out scientific inquiry (investigation), communicate and critique results through peer review. Formulate testable hypotheses. Develop and explain the appropriate procedures, controls, and variables (dependent and independent) in scientific experimentation. Explain how electric motors work. Draw conclusions from inquiries based on scientific knowledge and principles, the use of logic and evidence (data) from investigations. Math Construct logical verifications or counter-examples to test conjectures and to justify or refute algorithms and solutions to problems. Apply various measurement scales to describe phenomena and solve problems. Use radian and degree angle measurement to solve problems and perform conversions as needed. Use trigonometric relationships to determine length and angle measure; i.e., Law of Sines and Law of Cosines. Technology Students use technology tools to enhance learning, increase productivity, and promote creativity. Students employ technology in the development of strategies for solving problems in the real world. Students will develop an understanding of the cultural, social, economic, and political effects of technology. Students will develop an understanding of the influence of technology on history. Students will develop an understanding of the attributes of design. Students will develop an understanding of engineering design.