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Chapter 10 CIRCULAR MOTION Centripetal Vs Centrifugal

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Rotation vs Revolution Rotation: an object spins about an internal axis The Earth rotates on its axis once every 24 hours Revolution: movement around an external axis The earth revolves around the sun once every days (1 year)

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Rotational Speed Period: time to complete one full rotation; measured in seconds Frequency: rotations per second (minute, hour); measured in hertz (sec -1 ) or rpm Rotational speed is the same thing as frequency

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Centripetal Force Law Of Inertia: objects naturally move in straight paths Centripetal Force is a force applied at 90 o to the path of an object causing it to curve (move in a circle) Force and acceleration at right angles to velocity

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Measuring Centripetal Force Force = mass x acceleration F c = m a c Measured in newtons (N) Centripetal Acceleration = velocity squared/ radius a c = v 2 / r Measured in m/s 2

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Real Force vs Fictitious Force Centripetal Force Real Cause objects to move in a curved path Vector, directed towards center of curve (circle) Centrifugal Force Fictitious Actually inertia: resistance to moving in a circle Newton’s 3 rd Law Simulated Gravity: carnival rides; space stations

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