Two necessary factors for doing work: the force acting on the object and the distance the object passes in the direction of the force. Definition of classical mechanics: When a force acts on an object and makes the object pass a certain distance along the direction of the force, it is said in mechanics that the force has done work on the object.

Work is scalar, there is no direction problem, but there are positive and negative points, when 90

Extended data:

Different forms of energy in nature correspond to different forms of motion: the motion of objects has mechanical energy, the motion of molecules has internal energy, the motion of charges has electrical energy, and the motion inside the nucleus has atomic energy.

Different forms of energy can be transformed into each other: "friction heat generation is to transform mechanical energy into internal energy by overcoming friction to do work;" When the water in the kettle boils, steam acts on the lid and lifts the lid, indicating that internal energy can be converted into mechanical energy.

Electric current can convert electric energy into heat energy through the work of electric heating wire, and so on. "These examples show that different forms of energy can be transformed into each other, and this transformation process is completed by doing work, and work is the amount of energy transformation.