Question

technician a says that work is performed any time an object is moved. technician b says that any time force is applied to an object, work is performed. who is correct? select one: a. technician a b. technician b c. both a and b d. neither a nor b

Explanation:

Work is calculated as \(W = F\times d\times\cos\theta\) (where \(F\) is force, \(d\) is displacement, and \(\theta\) is the angle between the force and displacement vectors). For work to be done, there must be a non - zero component of force in the direction of displacement. Just moving an object (\(d
eq0\)) without a force component in the direction of motion (e.g., moving a book horizontally while holding it vertically, \(F\) and \(d\) are perpendicular, \(\cos\theta = 0\), \(W = 0\)) doesn't mean work is done. Also, applying a force (\(F
eq0\)) without displacement (\(d = 0\)) (e.g., pushing a wall) results in \(W=0\). So, Technician A's statement that work is performed any time an object is moved is wrong (because direction of force and displacement matters), and Technician B's statement that any time force is applied work is performed is wrong (because displacement is also required).

Answer:

d. Neither A nor B