energy output

• http://slinging.org/forum/YaBB.pl?num=1245535425
• http://slinging.org/forum/YaBB.pl?num=1244636747

energy comparisons

• compound bow draw weights are 30 - 100 lbs, and put out 150 joules
• firearm ammunition has energies from 500 to 15,000 joules

other physics

• http://slinging.org/forum/YaBB.pl?num=1285124225/24#24

concepts

• rotation around a fixed axis — dynamics
• torque diagram
  • torque
  • angular momentum
• angular velocity
• angular acceleration
• moment of force
• rotational energy
• centripetal force
• lever arm