Final answer:
False. A force acting upon an object at a 90-degree angle to the direction in which it is moving does not do negative work.
Step-by-step explanation:
False
A force acting upon an object at a 90-degree angle to the direction in which it is moving does not do negative work. Negative work occurs when the force and displacement are in opposite directions. In this case, the force is perpendicular to the object's motion, so no work is done.
For example, imagine a car moving forward and a force acting sideways on the car. Since the force is perpendicular to the direction of motion, it does not oppose or assist the car's forward motion, and therefore does not do negative work.