Which one of the following is NOT an example of work being done?

In physics, work is done when a force causes displacement in the direction of that force. For the Moon in its orbit, Earth’s gravitational force points toward Earth while the Moon’s motion is approximately sideways, so gravity does no work on it in a circular orbit. Pushing the box, pulling the sled, and lifting the bag all involve force causing displacement, so those are examples of work.

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