Carla has been working out and is trying to show her friends how much work she can do. In which of the following situations woul
d she not be doing work? A. If she pushed a very large mass across a room. B. If she carried heavy boxes up a long flight of stairs. C. If she held a very heavy pair of weights in front of her. D. If she lifted a heavy barbell over her head and lowered it back down to the floor several times.
Answer: Option C) if she held a very heavy pair of weights in front of her
Explanation:
Work is done when force is applied over a distance. i.e Workdone = Force X Distance
However, Since Carla's applies force to hold the heavy pair of weights BUT no distance is being covered due to the static (non-moving) posture she took, no work is done at that moment in time.
