The everyday use of the term ‘work’ refers to any effort or activity that expends energy, while the scientific definition of work involves a force causing a displacement in the direction of the force.
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Living beings need energy to perform life processes and other activities, while machines need energy to operate and perform tasks.
Both living beings and machines need energy to perform various activities and functions.
Some engines require fuel like petrol and diesel because they convert the chemical energy in the fuel into mechanical energy to perform work.
Humans use animals to lift weights, carry loads, pull carts, and plough fields.