Question

which best identifies the requirements for work to be performed? an object that has a force acting on it an object that is snowing and has no net force a force acting on a motionless object a force that moves an object

Explanation:

In physics, work is defined as the product of force and displacement in the direction of the force, i.e., \( W = F \cdot d \cdot \cos\theta \) (where \( W \) is work, \( F \) is force, \( d \) is displacement, and \( \theta \) is the angle between force and displacement). For work to be done, a force must cause displacement (movement) of the object. Option A: Just a force on an object with no movement means no work. Option B: If an object is moving with no net force, the force doing work (if any) isn't causing the motion (constant velocity, so work from net force is zero). Option C: A force on a motionless object (no displacement) means no work. Only option D describes the key requirement (force causing movement) for work.

Answer:

D. a force that moves an object