Cross product Torque Relationship between torque and angular acceleration Problem solving Lecture 21: Torque.

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Presentation transcript:

Cross product Torque Relationship between torque and angular acceleration Problem solving Lecture 21: Torque

What causes rotation? Demo: bolt and wrench Need: Force Distance Perpendicular component

Vector cross product: magnitude

Vector cross product: Direction Direction: right hand rule thumb × index finger = middle finger

Torque

Direction of torque

Angular acceleration of rigid object Begin with extended free-body diagram that shows forces and where they act on the object

Example 1:

Example 2: Rolling w/o slipping

Example 3: Coupled objects