Work is defined as the force applied over a distance.
* Force: A push or pull that can change an object's motion.
* Distance: The amount of space an object moves.
For work to be done, both force and displacement (movement) must occur in the same direction.
Examples:
* Work Done: A person pushing a box across a floor does work. The force applied is in the same direction as the box's movement.
* No Work Done:
* A person holding a heavy weight: The force is upward, but there is no displacement.
* A book sitting on a table: Gravity exerts a force downward, but the book isn't moving.
* A satellite orbiting Earth: The force of gravity keeps it in orbit, but the satellite's motion is perpendicular to the force.
Key Takeaway:
The crucial factor is the alignment of force and displacement. If they are in the same direction, work is done. If they are perpendicular or the object doesn't move, no work is done.
