Ok let me start over a ten inch diameter, ten pound ball is accelerated to ten mph in ten inches. It is easy to calculate the force pounds on the back wall of the tube the ball is in (not the force exerted on the ball). As the ball travels down the tube it goes thru a ninety degree twenty inch...
Ok to make this easy let's start with a 10 lb Bowling ball (let's even say 10 inch diameter) moving at 10 mph. What is the difference in the forward force (energy) required to stop the ball verses the energy applied the move the ball through a 90 degree curve with a 20 inch diameter arc. In...