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Circular Motion

Circular Motion. Rotation and Revolution. What is an axis ? The straight line around which a rotation takes place. Rotation and Revolution. When the object turns around an internal axis (the axis is located within the body of the object)… the motion is called rotation.

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Circular Motion

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  1. Circular Motion

  2. Rotation and Revolution • What is an axis? The straight line around which a rotation takes place

  3. Rotation and Revolution • When the object turns around an internal axis (the axis is located within the body of the object)… the motion is called rotation • http://www.youtube.com/watch?v=9LzZ1ORjSjk

  4. Rotation and Revolution • When an object turns around an external axis…. the motion is called a revolution

  5. Rotation and RevolutionReview

  6. Review • The Earth ______ around the sun once every ____. • The Earth _____ around an axis (through it’s poles) once every _____. • Revolves • 365.25 days • Rotates • 24 hours

  7. Please define the following vocabulary words • 1) axis 9) center of gravity • 2) centrifugal force 10) center of mass • 3) centripetal force • 4) linear speed • 5) revolution • 6) rotation • 7) rotational speed • 8) tangential speed Vocab quiz Thursday

  8. Review 1) Match the following terms: Orbit Revolve Spin Rotate 2) Which object rotates and which revolves? Top? Moon? Orbit → Revolve Spin → Rotate Rotates Revolves

  9. Review Is it correct or incorrect to say that the Earth is rotating around the Sun? Why?

  10. Rotational Speed • Which moves faster, the outer horse on a merry go round or the inner horse?

  11. Rotational Speed 2 parts 1) Linear Speed = Distance Time 2) Rotational Speed= Rotations Time

  12. Review • At the center of the axis, do you have linear or rotational speed? • Rotational

  13. Review • As you move outward do you increase your linear or rotational speed? • Linear

  14. Review • 1) Which part of the Earth’s surface has the greatest rotational speed? Linear speed? • All parts have the same rotational speed • The equator has the greatest linear speed

  15. 2) Trains ride on a pair of tracks. When traveling in a straight line, the tracks are the same length. But which track is longer for a curve, the one on the outside on the one on the inside curve?

  16. Summary • In a rigid rotating system, all parts have the same (rotational, linear) speed, but the (rotational, linear) speed varies. rotational, linear Linear speed depends on the _____ from the axis of rotation and on the _____ speed. distance, rotational

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