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11_09_Rotational_Energy

11_09_Rotational_Energy - 11/9 Rotational Energy Today...

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11/9 Rotational Energy / Today: Torque and Energy / Presentation “Pulling a Disk” / Upcoming presenters please see me / Holiday Monday!!! No Lab Next Week!!! / HW “Torque with acceleration” Due Wednesday 11/14 / HW “Rotational Energy” Due Thursday 11/15
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Find the acceleration of the disk, both angular and CM. No friction W E,D N F,D T S,D a = F net = α = τ net = T = ma a = T m τ net = I α F net = ma Tr = 1 / 2 mr 2 α I disk = 1 / 2 mr 2 (I ring = mr 2 ) r α = 2T m Does a = r α ? What does “no” mean? Slipping! Which way? = a R W E,D N F,D T S,D a = F net = α = τ net = τ net = I α F net = ma f F,D ? r r No slipping allowed due to friction Does a = r α ?
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No slipping allowed due to friction I disk = 1 / 2 mr 2 (I ring = mr 2 ) W E,D N F,D T S,D a = F net = α = τ net = τ net = I α F net = ma f F,D ? F net = ma = T + f τ net = I α = rT - rf τ net = 1 / 2 mr 2 = r(T - f) a r r α = a r 1 / 2 ma = T - f ma = T + f
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11_09_Rotational_Energy - 11/9 Rotational Energy Today...

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