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Ch. 12 – Rotational Motion

Ch. 12 – Rotational Motion. I. Torque:. Measurement of a force perpendicular to a lever arm. A. T = F perp d (SI Units = Nm). B. Balanced Teeter-Totters:. To balance, torques must be equal!. 1. F perp d = F perp d. 2. If one side has a larger Force (weight) than the other,.

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Ch. 12 – Rotational Motion

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  1. Ch. 12 – Rotational Motion I. Torque: Measurement of a force perpendicular to a lever arm A. T = Fperpd (SI Units = Nm) B. Balanced Teeter-Totters: To balance, torques must be equal! 1. Fperpd = Fperpd 2. If one side has a larger Force (weight) than the other, the distance (length of lever) must change inversely C. Unbalanced Teeter-Totters: The CG is always on the side with the most torque

  2. The resistance of objects to changes in their rotational motion. II. Rotational Inertia (I): A. Equation: I = mr2 1. SI units = kgm2 2. The greater the distance the mass is from the CG, the greater the rotational inertia (balancing a broom) B. Rolling: Involves linear motion and rotational motion *** a barrel of water vs. a barrel of ice *** C. Angular Momentum: Like regular momentum, but is the product of rotational inertia and rotational velocity *** Angular momentum = I W *** D. Conservation of Angular Momentum: Decreasing inertia of a system increases the velocity, and vice versa (ice skaters, etc.) *** IWbefore = IWafter ***

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