1. Belts and gears Consider 2 wheels of the same mass but different radius connected by a belt or chain Little left Wheel Choose Big right wheel II V at aV at b ωω αα Tension at aTension at b Torque at aTorque at b a b Realize that for every one spin of the big wheel, the little wheel spins ____________.

2. Belts and gears Consider 2 wheels of the same mass but different radius connected by a belt or chain Little left Wheel Choose Big right wheel II V at aV at b ωω αα Tension at aTension at b Torque at aTorque at b a b < = > > = < Realize that for every one spin of the big wheel, the little wheel spins twice.

3. Little left gear Choose Big right gear V at aV at b ωω αα Force of left tooth on right tooth Force of right tooth on left tooth Torque at aTorque at b a b

5. What is a Gear Box?