Work, Energy and Power
Useful jobs such as lifting containers onto a ship can be done by cranes if they have a source of supply of what we call energy. Cranes can lift their loads by burning oil or petrol. People can do similar jobs, for example lifting cases into the boot of a car. In order to do this, they must take in energy by eating food. If we were unable to get this ‘food energy’, or chemical energy as scientists call it, we could not work and we would grow weaker and weaker.
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