Unit 2: Force, Motion, and Energy

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Unit 2: Force, Motion, and Energy

Outline of Presentation
Progression of learning G10 Electricity and Magnetism learning competencies G10 Electricity and Magnetism goals and objectives Learning activities Sample activity Discussion of results Application of concepts derived from the activities DEPARTMENT OF EDUCATION

Electricity and Magnetism
Electric Charge Electric Force Electric Field Electric Potential Electric Current (I) Electrostatics Magnetic Field and Current Electrical Power Electrical energy Electric circuit/connection Ohm’s Law Gr. 7 Electric charges Attraction/Repulsion between charges Flow of charges (Simple electric circuit) Gr. 8 Electric current (I, V, R relationship) Electrical connections (connections at home)

World of Electricity and Magnetism
Electric Charge Electric Force Electric Field Electric Potential Electric Current (I) Electrostatics Magnetic Field and Current Electrical Power Electrical energy Electric circuit/connection Ohm’s Law EM Induction Magnetic Field (B) Magnetism B due to I Force of B on I Electromagnets Motors Faraday’s Law Generator/Transformer Power Transmission Magnetic Field Magnetic forces

Power Generation, Transmission, and Distribution
Grade 9 Power Generation, Transmission, and Distribution Source: Where does electricity come from? How is it produced? How does it get to our home?

What happens inside the generator? How does it “produce electricity”? Source:

Grade 10 Electric Motor Applications of EM Waves (including Light)
How else is electrical energy changed into other forms of energy that are useful to us? Source:

G10 Force, Motion, and Energy Electricty and Magnetism
Learning Competencies Demonstrate the generation of electricity by movement of a magnet through the coil Explain the operation of a simple electric motor and generator Which then brings us to these learning competencies found in our science curriculum guide (Grade 10). But before the learners achieve these competencies, they have to go through more specific objectives DEPARTMENT OF EDUCATION

G10 Force, Motion, and Energy Electricty and Magnetism
Goals/Objectives Understand the nature of magnet/magnetic field Magnetic domains Exploring magnetic field a. around permanent magnets of different shapes; b. between like and unlike poles; c. around a straight current-carrying conductor; d. around a current-carrying loop of wire; and e. around the Earth. DEPARTMENT OF EDUCATION

G10 Force, Motion, and Energy Electricty and Magnetism
Goals/Objectives Understand the relationship between electricity (electric current) and magnetism (magnetic field) and use this relationship in explaining principles behind generators, motors and other devices (recording devices) Investigate what happens when a current carrying conductor is placed within a magnetic field a conductor is moved within a magnetic field DEPARTMENT OF EDUCATION

The Floating Paper Clip
Getting hooked ... The Floating Paper Clip

DEPARTMENT OF EDUCATION
Learning Activities Magnetism Activity 1 For the Record… Getting familiar with the various equipment commonly found inside a radio broadcasting studio Activity 2 Test Mag...1, 2! Observing interactions between magnets and between a magnet and ‘non-magnet’ Activity 3 Inducing Magnetism Inducing magnetism in a magnetic material Activity 4/5 Detecting Magnetism/Oh, Magnets… Determining direction of magnetic field around a permanent magnet using magnetic compass/magnetic field creater DEPARTMENT OF EDUCATION

DEPARTMENT OF EDUCATION
Learning Activities Electricity and Magnetism Activity 6 Electric Field Simulation Activity 7 Magnetic Field Simulation Comparing electric and magnetic field lines using PhET Interactive Simulations Project DEPARTMENT OF EDUCATION

Learning Activities Magnetism from Electricity
Activity Magnetic Field around Current-Carrying Conductors Activity Making your Own Electric Motor Electricity from Magnetism Activity Let’s Jump In Generating electricity with the aid of the Earth’s B Activity Principles of Electromagnetic Induction Investigating factors affecting the strength and direction of B

Sample Activity

Activity 8: Magnetic Field around Current-Carrying Conductors
Objectives Using a compass, explore the magnetic field around current-carrying conductors. Use the magnetic compass to determine the direction of a magnetic field A. around a straight current-carrying conductor; and B. at the center of the current-carrying coil.

Part A: Magnetic Field around a Straight Conductor
* Setup conductor supply Source: Materials needed Straight current- carrying conductor setup* Power supply/Dry cells Connecting wires Magnetic compass Cardboard/Illustration board

Part B: Magnetic Field at the Center of a Coil
Materials needed Current-carrying coil setup* Power supply/Dry cells Connecting wires Magnetic compass Cardboard/Illustration board * Setup Source:

Part A without current with current Conductor Top View
out of the paper Conductor Magnetic compass into the paper with current X without current

Part B + - - without current + with current Side View Clockwise
Counterclockwise - without current + with current

Activity Proper

Hans Christian Oersted
The story behind... In 1819, Hans Christian Oersted, a Danish physicist and chemist and a professor in the University of Copenhagen, discovered during a class demonstration that a current carrying wire would deflect the compass needle. He inferred that an electric current would induce a magnetic field. Hans Christian Oersted (1777–1851)

Guide Questions Part A From a top-view perspective, in which direction does the north pole of the compass needle point when placed around the straight current-carrying conductor? If the direction of the current is reversed, in which direction does the needle point?

Part B: Magnetic Field at the Center of a Coil
+ -

Visualizing Magnetic Field
Iron Fillings Magnetic Compass

Direction of Magnetic Field
Right Hand Rule (RHR) If a current carrying conductor is imagined to be held in the right hand such that the thumb points in the direction of the current, then the tips of the fingers encircling the conductor will give the direction of the magnetic lines (magnetic field) Current Magnetic Field

Force on a current-carrying conductor in a magnetic field
What happens when a current -carrying conductor is placed within a magnetic field? EM Swing

Force on a current-carrying conductor in a magnetic field
The direction of the force on a current carrying conductor in a magnetic field can be determined by using the right hand rule (RHR) I B F

Working Principle of Electric Motor
Application: Working Principle of Electric Motor Electric Motor

DEPARTMENT OF EDUCATION
Concept Check A current carrying wire is perpendicular to the card as shown in the figure below. Which of the arrows in the figure shows the direction of the magnetic field at point Y ? A B C D Y + - DEPARTMENT OF EDUCATION

DEPARTMENT OF EDUCATION
B C D Concept Check A wire conductor is placed between the poles of a strong permanent U magnet as shown in the figure below. The direction of current I through the wire is also shown. Which arrow indicates the direction of the force on the wire? I B A DEPARTMENT OF EDUCATION

DEPARTMENT OF EDUCATION
B C D Concept Check A rectangular loop of wire OPQR carrying a current is in a uniform magnetic field as shown in the figure below. What is the direction of the force on PQ? to the right to the left vertically upwards vertically downwards DEPARTMENT OF EDUCATION

Concepts Learned Magnetic Field
An electric current produces magnetic effect around the conductor (called Magnetic Field) The magnetic field surrounding a current-carrying conductor can be shown by sprinkling iron filings or arranging magnetic compasses around the conductor The compasses line up with the magnetic field (a pattern of concentric circles about the wire) produced by the current. When the current reverses direction, the compasses turn around, showing that the direction of the magnetic field changes also.

Concepts Learned Motor Effect
A current-carrying conductor when placed in a magnetic field experiences a force. If the direction of the field and that of the current are mutually perpendicular to each other, then the force acting on the conductor will be perpendicular to both. This is the basis of an electric motor. The direction of the magnetic field, current and force can be determined using the RHR.

Inquiry in Practice Process Skills
Engaging in scientific-oriented questions Gathering evidence Providing explanations based on evidence Communicating explanations Process Skills Observing Inference Predicting Experimenting Communicating explanations

Thank you 