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Angular momentum of rigid bodies,When to add (moment of inertia*angular velociy) 
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#1
Jun612, 02:12 PM

P: 36

The rigid 30lb plank is struck by the 15lb hammer
head H. Just before the impact the hammer is gripped loosely and has a vertical velocity of 75 ft>s. If the coefficient of restitution between the hammer head and the plank is e = 0.5, determine the maximum height attained by the 50lb block D. The block can slide freely along the two vertical guide rods. The plank is initially in a horizontal position. link to diagram : http://s3.amazonaws.com/answerboard...88a74b8565.png I applied the conservation of angular mom. thm, but after checking the solution manual , I realized that they applied the thm but adding for the whole system ,they took for the plank ,hammer, and block, m(Vg)*(distance to point B) , BUT (this is my real quistion ) ,for the plank they did , [m(Vg)*(distance to point B)] +[Ig*w] ......my quistion is why was'nt the Igw term added for the block and hammer ,and why was it added to the plank 


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