I am looking for some clarity on what should be general conceptual questions involving work, net work, and work done by friction. In General;
W[F]=the component of the applied force acting in the direction of motion X distance OR
W[friction]=μN and is opposite the direction of motion
W[net]= W[F] - W[f]
If the object is moving at a constant velocity, there is no net work (i.e. W[F]=W[f])
If there is net work there must be an acceleration
Finally, when work is done to overcome gravity, this work is just equal to the the force of gravity (mg for force and mgh for work). I shouldn't concern myself with initial acceleration when the object is lifted and deceleration as the object comes to rest because this is factored into an average acceleration? In a case such as this, the applied force does the work W=mgh. Does gravity do any work? or does gravity only do work when the object falls some h?
The Attempt at a Solution
Thanks in advance. I'm making sure i have these concepts straight. I've been seeing questions that give necessary parameters of a problem but state that the velocity is constant and ask for the net work. I feel like no calculations are necessary but would like to confirm that i do understand the terms work, net work, and work due to friction.