Yes. Blunt force injury can cause traumatic cataracts but does not cause cataracts every time.
Yes. Direct trauma or repeated trauma (boxers) can cause cataract formation. It can also cause further injury to the lens suspension system that can increase risks in cataract surgery.
Certainly! The blunt trauma can cause cataract, and also knock the lens loose inside the eye making the surgery a major challenge at times!
Yes. Sometimes the force that hits the eyes is sufficient to carry enough energy to the lens that it will opacify and become a cataract. That in fact is why the name traumatic cataract exists.