Which of the following examples does not make use of a mechanical advantage?

Sliding a heavy box along a concrete floor.

Explanation

While sliding the box along the floor may be easier and less dangerous than lifting it, no mechanical advantage is used. All the other answers use a mechanical advantage. A pry bar is a type of lever that provides a mechanical advantage. A screwdriver uses a mechanical advantage because the handle has a greater diameter than the point of the screwdriver. That is much like a big wheel (handle) geared to a smaller wheel (tip of screwdriver). A wheelbarrow provides more than one mechanical advantage. It uses leverage with a fulcrum; it also uses a wheel and axle arrangement.

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