# lecture14 - Exam II Physics 101 Lecture 14 Torque and...

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Physics 101: Lecture 14, Pg 1 Physics 101: Physics 101: Lecture 14 Lecture 14 Torque and Equilibrium Torque and Equilibrium Today’s lecture will cover  Textbook Chapter 8.2-8.4  Exam II

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Physics 101: Lecture 14, Pg 2 Review Review Rotational Kinetic Energy K rot = ½ I ϖ 2 Rotational Inertia I = Σ m i r i 2 Energy Still Conserved! Today Torque
Physics 101: Lecture 14, Pg 3 You Know Torque! You Know Torque! A meter stick is suspended at the center. If a 1 kg weight is placed at x=0. Where do you need to place a 2 kg weight to balance it? A) x = 25 B) x=50 C) x=75 D) x=100 E) 1 kg can’t balance a 2 kg weight. Balance Demo 1 kg 2kg 50 cm 0       25       50      75       100

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Physics 101: Lecture 14, Pg 4 Torque Torque Rotational effect of force. Tells how effective force is at twisting or rotating an object. τ = +- r F perpendicular = r F sin θ Units N m Sign: CCW rotation is positive
Physics 101: Lecture 14, Pg 5 ACT ACT The picture below shows three different ways of using a wrench to loosen a stuck nut. Assume the applied force F is the same in each case. In which of the cases is the torque on the nut the biggest ? A. Case 1 B. Case 2 C. Case 3 CORRECT

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Physics 101: Lecture 14, Pg 6 ACT 2 ACT 2 The picture below shows three different ways of using a wrench to loosen a stuck nut. Assume the applied force F is the same in each case. In which of the cases is the torque on the nut the smallest ? A. Case 1 B. Case 2 C. Case 3 CORRECT
Physics 101: Lecture 14, Pg 7 Torque Example and ACT Torque Example and ACT A person raises one leg to an angle of 30 degrees. An ankle weight (89 N) attached a distance of 0.84 m from her hip. What is the torque due to this weight?

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