We know we have exrted a force even when we have done no work. This is called ________________________________________.  afriction bmotion ceffort dfail

The correct answer to the question is c. effort.

In physics, we can exert a force without doing work on an object. Work is defined as the product of force and the displacement of the object in the direction of the force. If there is no movement (displacement) or if the force is applied perpendicular to the displacement, then no work is done. Nevertheless, the exertion of force is still referred to as effort, even if it does not result in work being done. This concept is essential in understanding how forces operate in various physical contexts, such as when lifting an object that does not move or when pushing against a stationary object.