Question

what is work?
oa a measure of the energy transferred when a force is applied to an object through a distance
ob a push or pull on an object resulting from the objects interaction with another object
oc a calculation of the change in potential energy of an object as the object is displaced
od a ratio of the output force to the input force in the system in which an object is moved

Explanation:

• Option A: Work is defined as the energy transferred when a force acts on an object and displaces it. The formula for work is \(W = F\times d\times\cos\theta\) (where \(F\) is force, \(d\) is displacement, and \(\theta\) is the angle between the force and displacement vectors). This option correctly captures the essence of work as an energy - transfer measure due to force - displacement interaction.
• Option B: A push or pull on an object is the definition of force (\(F\)), not work.
• Option C: Work is not just a calculation of the change in potential energy. While work can be related to potential - energy changes (e.g., \(W=-\Delta U\) for conservative forces), it is a more general concept that can also involve kinetic - energy changes (\(W=\Delta K\) from the work - energy theorem \(W = K_{f}-K_{i}\)).
• Option D: The ratio of output force to input force is related to the concept of mechanical advantage (\(MA=\frac{F_{out}}{F_{in}}\)) in machines, not work.

Answer:

A. a measure of the energy transferred when a force is applied to an object through a distance