1. Magnets
1.1. An object that attracts magnetic materials such as iron and steel
1.2. Types of magnets
1.2.1. U-shape magnet
1.2.2. Bar magnet
1.2.3. Cylinder magnet
1.2.4. Horseshoe magnet
1.2.5. Button magnet
1.2.6. Ring magnet
1.3. Properties of magnets
1.3.1. A magnet has two poles
1.3.1.1. North pole (N-pole)
1.3.1.2. South pole (S-pole)
1.3.2. The magnetic force is stronger at the poles
1.3.3. When hung freely, the N-pole will point to the north.
1.3.4. Attraction and repulsion
1.3.4.1. Like poles repel each other, unlike poles attract each other
1.4. Uses
1.4.1. Refrigerator magnet
1.4.1.1. Holds papers and pictures on metallic surfaces
1.4.2. Bank card
1.4.2.1. Stores information
1.4.3. Compass
1.4.3.1. Points north for navigation
1.4.4. Maglev trains
1.4.4.1. Levitate trains off the tracks
1.5. Methods to make magnets
1.5.1. Stroking method
1.5.2. Electrical method
2. Light Energy
2.1. Sources of light
2.1.1. Fire
2.1.2. Light Bulb
2.1.3. Fireworks
2.1.4. Sun
2.1.5. Lightning
2.2. Features
2.2.1. Light moves in a straight line
2.2.1.1. A shadow is formed when light is blocked
2.2.1.2. Light can be reflected
2.2.2. Light is made up of different colours
2.2.2.1. Red
2.2.2.2. Orange
2.2.2.3. Yellow
2.2.2.4. Green
2.2.2.5. Blue
2.2.2.6. Indigo
2.2.2.7. Violet
3. Force and Movement
3.1. Exerting a force
3.1.1. Push and Pull
3.1.1.1. Push is when you are pressing something away from you
3.1.1.2. Pull is when you delay something to make it closer to you
3.1.2. Types of forces
3.1.2.1. Gravity
3.1.2.2. Elastic
3.1.2.3. Magnetic
3.1.2.4. Friction
3.1.3. Effects on an object
3.1.3.1. Changes the shape of an object
3.1.3.2. Moves an object
3.1.3.3. Stops a moving object
3.1.3.4. Changes the direction of a moving object
3.1.3.5. Increase or decrease the speed of a moving object
4. Sound Energy
4.1. A form of energy that we can hear
4.2. It can be loud or soft
4.3. Sound can travel through solids, liquids and gases.
4.4. Sound travels at different speeds through different materials.
4.4.1. Air (Gas)
4.4.1.1. 343 meter per second
4.4.2. Water (Liquid)
4.4.2.1. 484 meter per second
4.4.3. Iron (Solid)
4.4.3.1. 5120 meter per second