1. Scientific Work

In science, work happens only when a force moves an object a distance in the direction of the force:
\[ W = F \times d. \]

Work is measured in joules (J). Pushing a box across the floor is work. Holding a heavy box still is not scientific work because the distance moved is zero.

Deep explanation. Scientific work is not the same as everyday effort. Work requires force and displacement in the direction of the force. If you push a wall and it does not move, you may get tired, but the work done on the wall is \(0\text{ J}\) because distance is zero. If you lift a box upward, your upward force and the box's upward motion are in the same direction, so work is done.

Units help you choose the formula. Force is in newtons, distance is in meters, and work is in joules. One joule equals one newton-meter. If a \(30\text{ N}\) force moves an object \(2\text{ m}\), the work is \(60\text{ J}\).

GED® routine. Identify the force, identify the distance moved in the force's direction, then multiply. If the object does not move, work is zero. If the force is not in the direction of motion, only the force component in that direction does work.

⚠️ Common misconception: if it feels tiring, it must be work. In physics, no movement means no work.

💡 Tip: work needs both force and distance.