# 00.pdf - Chapter 9.1-9.3 Torques'Twists So far we have...

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Chapter 9.1-9.3 Torques ('Twists‘) So far, we have considered problems in which it doesn’t matter which point we choose to apply the force on an object. How about those cases in which the point of application of the force does matter? Example: opening a door

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Chapter 9.1-9.3 Torques ('Twists‘) Hold •Hold and push down or up at different places •What happens if let go of 'hold'? Hold 'Twist' depends on force and position force applied
Equilibrium Equilibrium – Accel = 0 Static Equilibrium – Accel = 0 AND velocity=0 Stationary What happens? What happens?

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‘Paper clip Twists' Work in pairs. Get 5 paper clips, a rubber band and a pen/pencil. Paper-clip scale: 1. Unbend paper clip, fold it in the mid- section, as shown 2. Unbend another one and “wrap it” around a pen/pencil; 3. Join them by a rubber band 4. Attach paper clips on lever arm.
Torque – Tendency to rotate object 1 clip on each side Same distance from center. What happens? Why? No movement. “Torques and forces are balanced.” d d 1. No movement. Net torque is zero. 2. Positive net torque: rotates counterclockwise 3. Negative net torque: rotates clockwise

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1 clip on each side Different (d and 2d) distances from center.
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