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11_07_Torque

# 11_07_Torque - 11/7 Torque Angular Variables Today Torque...

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/ Today: Torque in Equilibrium / Presentation “Skidding Hula-Hoop” / Upcoming presenters please see me / HW “Equilibrium” Due Friday 11/9 / Holiday Monday!!! / For Wednesday: Torque with Angular Acceleration, α

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Skidding Hula-Hoop Released just above the floor with rotational velocity but translational zero velocity. v CM (or v T ) = 0 v R v CM v R v CM v R Center of Mass Just released Slipping with friction (skidding) Rolls w/out slipping 1 / 2 : 1 / 2 0 1 / 2 : 1 / 2 Does R + T = initial R? R T g S R T g S R T g S 0 0 0 0 0 0 1 / 2 : 1 / 2 ? Was energy conserved? Lost to friction Lost to friction Draw free body diagrams of the hula-hoop for slipping and rolling w/out slipping v CM = v R
Skidding Hula-Hoop Released just above the floor with rotational velocity but translational zero velocity. v CM (or v T ) = 0 v R v CM v R v CM v R Center of Mass Just released Slipping with friction (skidding) Rolls w/out slipping v CM = v R Draw free body diagrams of the hula-hoop for slipping and rolling w/out slipping N F,H f F,H W E,H W E,H N F,H a = F net = a = F net = 0 0

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Draw a FBD of the ring as it rolls down the ramp. h
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11_07_Torque - 11/7 Torque Angular Variables Today Torque...

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