1. For Lab # 3: Review Slides SS16 for Next Lecture Throw: Open Kinetic Link  proximal segments in front, distal segments behind projectile  sequential for  v  curvilinear path  mostly wheel-axle Push: Closed Kinetic Link  all segments behind projectile pushing the projectile or load  all segments behind projectile pushing the projectile or load  simultaneous for  F  rectilinear path  mostly lever motions

2. L: Angular Momentum  L = I   ω is angular velocity  I is rotational inertia - a body’s resistance to change angular motion  I = mk² mass x distance² that the mass is away from axis of rotation

3. Tt: Angular Impulse  Tt = Torque x time of Torque application  Tt =  L (i.e. I  -2 minus I  -1)  see Figure I.2 on page 328

4. T = F x FA F is board reaction FA is d  t is board recoil time

5. FIG I.3 page 328

6. Conservation of L  see Figure I.5 on page 330  L stays constant while airborne   changes due to changes in I  k changes from layout to tuck, to layout

7. FIG I.5 L = I  page 330 L = I 

8. FIG 15.1 page 494

9. Rotational Inertia : I  Resistance to a change in  (angular accel.)  I = m x r²   = T ( Torque  Rotational Inertia) I (Newton’s 2nd Law, page 318)  T = I x 

10. Turntable Demos: L = I   Twists about Longitudinal Axis  Spins about A-P Axis (break dance)  Sommies about M-L Axis