Work is defined as the transfer of [[Energy|energy]] when a [[Force|force]] is applied to an object, causing [[Displacement|displacement]]. The most general definition of work $W=\vec{F}\cdot \vec{d} $ Where: - $W$ is work (J) - $\vec{F}$ is force (N) - $\vec{d}$ is displacement (m) Work is only done if displacement occurs in the direction of the force. Positive work occurs when the force and displacement are in the same direction (e.g., pushing a cart forward). Negative work occurs when force opposes displacement (e.g., friction slowing an object).