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
- Power Plants Based on 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:
Electrostatic force is a type of force that occurs when certain materials become electrically charged due to friction. This force can attract or repel other objects without direct contact.
- When materials like rubber, plastic, or ebonite (a hard black material) are rubbed against another surface, static electricity is created.
- This occurs because the rubbing causes the materials to gain or lose tiny particles called electrons, making them electrically charged.
- When a material becomes electrically charged, it can attract small objects like paper or dust.
- For example, after rubbing a balloon on dry hair, the balloon can stick to a wall or attract small pieces of paper due to electrostatic force.
It is called "electrostatic" because the force comes from static (not moving) electricity. The charged material exerts a force on nearby objects even without touching them.
Experiment:
1. Aim: To observe the movement of objects due to rubbing and understand why this happens.
2. Requirements: small pieces of paper, thermocol or inflated balloon, silk cloth, plastic comb, dry hair, peacock feather, notebook.
3. Procedure
I. First Activity:
- Spread small pieces of paper on a table.
- Rub a piece of thermocol or an inflated balloon against a silk cloth.
- Bring it near the small pieces of paper.
II. Second Activity:
- Rub a plastic comb against dry hair.
- Bring it near the small pieces of paper.
III. Third Activity:
- Rub a peacock feather between two pages of a notebook.
- Bring it near your fingers and observe what happens.
4. Conclusion: In the above activities, the small pieces of paper, hair, and the peacock feather are seen to move when brought near the rubbed objects. This movement occurs due to the static electricity generated by rubbing, which causes attraction between the objects and the rubbed surfaces.
