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Material Type: Notes; Professor: Gapud; Class: Concepts of Physics; Subject: Physics; University: University of South Alabama; Term: Spring 2009;

Typology: Study notes

Pre 2010

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Download Circular Motion: Analogous to Linear Motion | Concepts of Physics | PH 104 and more Study notes Physics in PDF only on Docsity! Rotational Motion PH 104 w/ dr. g Lec 9 Circular motion: analogous to linear motion (mostly) Circular motion: analogous to linear motion (mostly) Tangential speed ~ radius x rotational speed. Rotational inertia: mass and mass distribution. Torque : causes or stops rotation. Centripetal force maintains circular motion. Angular momentum is conserved! Speed of an object moving in a circular path: Rotational = Ļ = angular: revolutions per sec (rpmās) Tangential = v = actual distance covered per second -- increases with increasing rpmās CircularĀ motion:Ā analogousĀ toĀ linearĀ motionĀ (mostly) Tangential speed ~ radius x rotational speed. -- increases with radius from center -- -- increases with increasing radius of path! v ~ Ļ ; v ~ r v ~ r x Ļ CircularĀ motion:Ā analogousĀ toĀ linearĀ motionĀ (mostly)Ā Rotational inertia: mass and mass distribution. Getting something to turn: Apply force Apply force far from rotation axis Apply force far from rotation axis, at right angle to radius Lever arm = separation of pivot from force If force applied parallel to lever arm: no rotation! Torque = force * lever arm (force at right angle to arm) = zero if force parallel to arm CircularĀ motion:Ā analogousĀ toĀ linearĀ motionĀ (mostly)Ā Torque : causes or stops rotation. Getting something to turn: Apply force Apply force far from rotation axis Apply force far from rotation axis, at right angle to radius Lever arm = shortest distance from force direction Torque = force * lever arm Keep something from turning: NET torque = zero (equilibrium) Balancing about center of gravity : Support must be below the center of mass CircularĀ motion:Ā analogousĀ toĀ linearĀ motionĀ (mostly)Ā Torque : causes or stops rotation. Gymnast Alexei Nemov doing a āplancheā