Here's why:
* Work is a measure of energy transfer. It's calculated as the product of force and displacement: Work (W) = Force (F) x Displacement (d)
* When force and displacement are in the same direction, the work done is positive. This means energy is being transferred to the object, causing it to speed up or move further.
* When force and displacement are in opposite directions, the work done is negative. This means energy is being taken away from the object, causing it to slow down or move in the opposite direction.
Example:
* Pushing a box across a floor: The force you apply and the box's displacement are in the same direction, so you do positive work on the box.
* Lifting a weight: The force you apply and the weight's displacement are in the same direction, so you do positive work on the weight.
Let me know if you have any more questions!
