Pulling the hand backwards reduces the difference in speed between the ball and the hand catching/stopping the ball. This reduces the impact force of the ball on the hand, reducing the possibility of injury.
Yes, absolutely. Even death if the person falls backwards and hits the head on something.
describe how a reflex can prevent injury
DEATH!
A guard is a device designed to prevent injury from rotating machinery.
It can prevent an accident or injury
It depends on what kind of injury. Bell Boots would prevent injury to the hooves. So would shoes. And leg wraps would prevent injury to the tendons in the lower leg. But like I said, it depends on what kind of injury you are triyng to prevent.
To prevent injury.
Absolutely not.
It can prevent an accident or injury
Crumple Zones prevent damage or injury by supplying a place in the structure of the frame to crumple in an accident.
Wear Knee Pads.
To prevent and treat illness or injury.