Work is defined as:

Work is defined in physics as the product of the force applied to an object and the distance over which that force acts in the direction of the force. This definition captures the essence of how work is accomplished: it requires both a force and a displacement in the same direction.

When a force is applied to an object and moves it through a certain distance, work is done on that object. The amount of work can be quantitatively expressed with the formula: Work = Force x Distance x cos(θ), where θ is the angle between the force and the direction of movement. When the force is in the same direction as the movement, this simplifies to Work = Force x Distance.

The other options each represent different concepts: the first describes a fundamental principle of force (push or pull), the third defines pressure (force per unit area), and the fourth relates to energy. While these concepts are important in physics and engineering, they do not specifically encapsulate the definition of work as it applies to the movement of objects under the influence of applied force. Therefore, the correct understanding is encapsulated in the definition that emphasizes both the application of force and the distance moved.