5. Which of the following options is NOT considered work in the scientific sense of the word?

Walking down a smooth sidewalk
Riding a bicycle
Throwing a ball
Pushing someone down a staircase

Pushing someone down a staircase

You sure

I apologize for the confusion. In the scientific sense of the word, work is defined as the product of a force applied over a distance. Therefore, pushing someone down a staircase could be considered work in the scientific sense, as it involves applying force over a distance. Walking down a smooth sidewalk, riding a bicycle, and throwing a ball also involve work in the scientific sense. None of the options provided can be definitively considered NOT work in the scientific definition.