I'm taking a mechanics course & I'm confused regarding the difference of Net Force & Net Torque. Net Force refers to linear motion & Net Torque refers to rotational motion, correct? So, is it possible to have a system where the net force is zero, but the net torque is not zero??? For example, force being applied wrench trying to move a bolt. And vice versa, is it possible to have a system where the net torque is zero, but the net force is not zero??? Like, if a square box was being pushed along the ground. And is it possible to have a system where both Net Force & Net Torque are not zero??? For example, a car in a head on collision, where its tires are still rotating forward, but it's skidding backwards from the collision. I'm not sure if I'm thinking of these concepts in the proper way. Any help, corrections to my thoughts, suggestions, or links to info would be greatly appreciated!