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lecture15 - Exam II Today's lecture will cover Textbook...

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Physics 101: Lecture 15, Pg 1 Today’s lecture will cover Textbook Chapter 8.5-8.7 Exam II

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Physics 101: Lecture 15, Pg 2 Review K rotation = ½ I ω 2 Torque = Force that causes rotation τ = F r sin θ Equilibrium Σ F = 0 Σ τ = 0 Today Σ τ = I α ( rotational F = ma) Ε nergy conservation revisited
Physics 101: Lecture 15, Pg 3 Linear Angular Displacement x θ Velocity v ω Acceleration a α Inertia m I KE ½ m v2 ½ I ω 2 N2L F=ma τ = I α Momentum p = mv L = I ω Today

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Physics 101: Lecture 15, Pg 4 Σ τ = I α Torque is amount of twist provide by a force » Signs: positive = CCW Moment of Inertia like mass. Large I means hard to start or stop from spinning. Problems Solved Like N2L Draw FBD Write N2L
Physics 101: Lecture 15, Pg 5 You want to balance a hammer on the tip of your finger, which way is easier A) Head up B) Head down C) Same 29% 63% 8% the larger the radius the larger the moment of inertia. I just tried it in my home and I guess it is easier to balance the hammer with the head up. Angular acceleration is smaller Why am I balancing a hammer on my finger? It sounds dangerous.

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Physics 101: Lecture 15, Pg 6 You want to balance a hammer on the tip of your finger, which way is easier A) Head up B) Head down C) Same τ = I α m g R sin( θ ) = mR 2 α mg R Torque increases
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lecture15 - Exam II Today's lecture will cover Textbook...

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