Topics
Natural Resources – Air, Water and Land
- Natural Resources
- Atmosphere and Its Layers
- Air Around Us
- Composition and Components of Air
- Importance of Air
- Air Pollution and Its Causes
- Water: Our Lifeline
- Availability of Water
- Composition of Water
- Importance of Water
- Scarcity of Water
- Land
- Soil Formation
- The Importance of Conserving Earth’s Natural Resources
The Living World
Diversity in Living Things and Their Classification
Disaster Management
Substances in the Surroundings –Their States and Properties
Substances in Daily Use
Nutrition and Diet
- Nutrients and Nutrition
- Component of Food
- Carbohydrates
- Diseases Due to Deficiency of Carbohydrates
- Fats (Lipids)
- Diseases Due to Deficiency of Fats
- Proteins
- Diseases Due to Deficiency of Proteins
- Vitamin and Minerals
- Diseases Due to Deficiency of Vitamin
- Diseases Due to Deficiency of Minerals
- Fibre
- Diseases Due to Deficiency of Fibre
- Water
- Diseases Due to Deficiency of Water
- A Balanced Diet
- Nourishment and Malnutrition
- Food Adulteration
Our Skeletal System and the Skin
Motion and Types of Motion
Force and Types of Force
Work and Energy
- Force, displacement and work
- Energy
- The relationship between work and energy
- Forms of Energy
- Mechanical Energy
- Heat Energy (Thermal Energy)
- Light Energy
- Sound energy
- Chemical Energy
- Transformation of Energy
- Energy Resources
- Conventional energy resources or non-renewable energy resources
- Non-conventional energy resources or renewable energy resources
- Energy saving and green energy
Simple Machines
Sound
Light and the Formation of Shadows
Fun with Magnets
The Universe
- Introduction
- Experiment
Introduction:
Magnetic force is the force that a magnet uses to pull or push certain objects, like iron, steel, nickel, and cobalt. Magnetic force becomes stronger when the object is close to the magnet. The farther away the object is, the weaker the magnetic force becomes.
- A magnet has two poles: North and South. Magnetic force is strongest at these poles.
- When an object made of iron or steel comes near a magnet, the magnet pulls the object toward it. This is due to magnetic force.
Examples:
- A fridge magnet is sticking to the fridge door.
- A magnet picks up paper clips.
- Magnets in a compass that help point in the north direction.
Attraction and Repulsion:
- Like poles (north-north or south-south) repel or push each other away.
- Unlike poles (North-South), they attract or pull each other together.
Experiment
1. Aim: To observe how a magnet attracts an iron nail and to understand the effect of distance on magnetic force.
2. Requirements: a magnet, a big iron nail, and a table.
3. Procedure
I. Magnet on the Table:
- Place the magnet on a table.
- Slowly bring the big iron nail close to the magnet.
- Observe what happens as the nail gets close to the magnet.
II. Magnet Held in the Air:
- Now, hold the magnet upright in the air, away from the nail.
- Move the nail closer to the magnet.
- Observe what happens when the nail is farther from the magnet compared to when it's close.
4. Conclusion: When the nail is brought near the magnet on the table, it sticks to the magnet due to the magnetic force. However, when the magnet is held in the air and the nail is farther away, the magnetic force weakens, and the nail does not move toward the magnet until it gets closer. This shows that magnetic force works best when the object is close to the magnet.
