7th Grade Magnetic Force PDF

7th grade Magnetic Force Topic 9: Lesson 2  Table of contents Magnetic force & 01 Energy 02 Magnetic Fields 01 Magnetic Force & Energy  Objectives ❖ What is a magnet? ❖ How can I identify a magnet? ❖ What happens when a mag...

7th grade Magnetic Force Topic 9: Lesson 2  Table of contents Magnetic force & 01 Energy 02 Magnetic Fields 01 Magnetic Force & Energy  Objectives ❖ What is a magnet? ❖ How can I identify a magnet? ❖ What happens when a magnet comes in contact with another magnet? ❖ When would a magnet attract strongest on an iron or another magnet?  Magnets A magnet attracts iron and materials that contain iron, or other metals They can be any size, like the ones you use in the kitchen, or Lines and arrows show the direction of the magnetic the entire earth and beyond field around earth. Magnetism Magnetism: magnets can attract or repel other magnets - depending on how they are placed The interaction between a magnet and a substance containing iron is always an Magnets on a fridge attraction  Magnetic Force How does magnetism work? It is caused by a force that can act at a distance This magnetic force is a push or a pull that occurs when a magnet interacts with another object Some large magnets can attract objects from many meters away! They can be powerful enough to lift a car or truck!  Exit ticket What did you learn today?  Is it a push or a pull? A magnet always exerts a pull on a magnetic object that is not itself a magnet Every magnet has two ends called magnetic poles, where the magnetic force is the strongest One pole is known as the North pole, and the other is known as the South pole  The arrangement of magnets determines which type of force exists between them! Repel Attract If the LIKE poles are close If the OPPOSITE ends are to each other, they REPEL! close to one another, they ATTRACT!  Two types of magnets Permanent or temporary Permanent Magnetism can be a permanent or Some materials that contain iron or temporary property of a material certain other materials can become permanent magnets after interacting with other magnets Temporary Other examples? An iron or steel object that is touching an What else can you think of? Electric object can become a magnet itself as current flowing through a conductor? long as contact exists  Magnets People can use magnetic compasses in navigation because the whole planet acts as a magnet A magnetic compass  Magnets and Potential Energy You have to put energy into the system to have them do the opposite of what they want to do! Examples?  02 Magnetic Fields  Features of Magnetic Fields Objects in the Magnetic force Magnetic field field Strongest at the The area of magnetic They experience a force poles - think of paper force around the in the magnetic field, clips stuck to the ends magnet - source of and line up with it. of the horseshoe magnetic energy - They become magnet one pole to the other temporary magnets. Single Magnetic Field What? Produced by one magnet Pole to pole Shape & Curve around the magnet Complete loops direction? North to South Never cross each other Strength? Strongest closer together Single Magnetic Field Combined Magnetic Field Two magnets placed near each What? other When two like poles are close together, the poles and the magnetic fields around them repel each other Shape & When two opposite poles are close together, the fields direction? combine to form a strong magnetic field between the two magnets Never cross each other WHOOA Earth acts as a very large magnet!!!!!  Earth's Magnetic Fields Materials in the core of the planet generate a The magnetic field magnetic field lines pass out of similar to the bar the core and magnet through the rocky mantle, and loop through the space Magnetic poles: near geographic 3-D and shaped like poles - strongest a donut here Used for navigation - magnetized needle that can turn easily and interacts with the magnetic field Earth's Magnetic Field  Protecting life on earth Solar Wind: constant stream of particles flowing from sun to earth. Earth's magnetic field PROTECTS US!!! They have electric charges and travel rapidly with a lot of energy HOW?????? If they reach earth, they could harm living things Protecting life on earth The electrically charged particles interact with magnetic forces Which changes the motion of the charged particles They flow towards the North and South poles, then past earth into space!!! Auroras!!! (Northern Lights) Cannot see this protective field, but there is evidence!! When the electrically charged particles travel along the magnetic field lines, they can collide with gas atoms in the upper atmosphere. This gives off light!