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
- Kinetic Energy (Energy of Motion)
- Other Forms of Energy
Introduction:
Energy is something that we need to do work. The capacity of a body (or anything) to do work is called energy. Without energy, nothing can happen or move. For example, when petrol or diesel burns in a motor vehicle, energy is released. This energy is what makes the vehicle move. If the petrol runs out, the vehicle stops moving. So, burning fuels like petrol or diesel gives energy.
Fuels:
- Coal
- Diesel
- CNG (Compressed Natural Gas)
- LPG (Liquefied Petroleum Gas)
- Petrol
These fuels are used in different machines to release energy in the form of heat.
Kinetic Energy (Energy of Motion):
When a person or a vehicle moves, the heat energy is converted into motion. Energy in motion is called kinetic energy. Anything that moves has kinetic energy. For example, the wind has kinetic energy because it is moving air. It can turn the blades of a windmill and make sailing boats or clouds move. All this movement happens because of the wind’s kinetic energy.
Machines that use kinetic energy: Some machines use kinetic energy to do their work.
For example:
- Ceiling fan
- Mixer-grinder
- Water pump
These machines get their kinetic energy from electricity, another form of energy that helps them move and work.
Other Forms of Energy:
Energy comes in different forms, not just heat. For example, electricity can be turned into different types of energy.
- TV: When we switch on the TV, electricity is converted into light energy and sound energy.
- Solar Cooker: This uses solar energy (energy from the sun) to cook food.
- Solar Water Heater: This also uses solar energy to heat water.
Plants use sunlight to make food, and the energy from sunlight is stored in the food they make. When we eat these plants or other food, the energy from the food helps us work and play. This stored energy in food burns inside our body and gives us the energy we need.
Burning substances for energy: When we burn fuels like coal or oil, the energy stored in them is released as heat energy. This heat energy can be used for cooking, heating, or running machines.
