Main Question or Discussion Point
I saw a baseball pitching machine that throws baseballs at 40-70mph with one wheel... All that wheel does is rotate and as the ball touches the rotating wheel it accelerates and comes flying out of the machine at an appropriate angle.. My question is: what is the physics behind that wheel on ball action? I understand torque but I don't get how it works since the ball is "parallel" to the wheel. There is nothing pushing the ball in a straight line... How is the energy transferred from wheel to ball??? Thanks!