Energy—How Things Work

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Energy is what makes things move, light up, produce sound, do work and change temperature. It is needed for all activities around us - from cooking food to running vehicles to lighting our homes.

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1. Food getting cooked (heat energy), 2. Fan rotating (electrical energy to movement), 3. Gas stove flame burning (chemical energy from fuel to heat)

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When air rushes out of the balloon, it pushes the balloon forward. The movement of air generates energy that makes the balloon move. This shows how stored energy (air pressure) can be converted to mot

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Sound energy is produced. When the rubber bands vibrate after being plucked, they create sound waves that we can hear. The vibration of the bands converts mechanical energy into sound energy.

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The water in sunlight becomes warmer because the Sun gives us heat energy. Solar energy heats up the water, while the water in shade doesn't receive direct sunlight and remains cooler.

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Food is the main source of energy for all living things. Humans, animals, and plants need food to get energy for movement, growth, and all life processes. Even our brain uses energy from food when we

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1. Cooking gas (LPG) - for cooking food, 2. Wood - for cooking and heating (in rural areas), 3. Kerosene - for lighting lamps and cooking (though less common now)

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Burning wood or coal creates smoke and pollution which is harmful to health and the environment. It also leads to deforestation when too many trees are cut for wood, and contributes to air pollution.