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To do any work, we need to apply force. A force can make things move. When a force moves something, work is done. A push or pull applied to an object is called force.
Example: A boy pulling a toy car, a boy pushing the paddles of a bicycle and a lady drawing water from a well.
To do any work, we need energy. Energy is the ability to do work. There are many forms of energy.
Sun is the greatest source of energy on Earth. It gives us heat and light. We also get energy from moving water, wind, and burning fuels.