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Circular Motion
The document discusses circular motion and Newton's laws of motion. It covers topics like circular motion in horizontal circles, vertical circular motion using a bucket of water as an example, and loop the loops. Key points covered include centripetal force, angular velocity, linear velocity, Newton's three laws of motion, and how tension and weight provide the necessary centripetal force for circular motion.
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Circular Motion
- 1. Physics Cir cular Mo tion
- 2. Circular motion Revision Circular motion in horizontal Vertical circular motion Loop-the-loop
- 3. Revision Newton’s LawsCircular motion in horizontal circles Centripetal force and acceleration Angular velocity, frequency & linear velocity
- 4. Newton’s first LawA body continues in a state of rest or uniform motion in a straight line unless it is acted upon by external forces.
- 5. No external forceThe body remains at rest. The body moves with a constant speed . Newton’s first Law
- 6. The rateof change of momentum of a body is proportional to and in the same direction as the resultant force that acts on it. Newton’s second Law
- 7. For fixed forceA body with a larger mass moves with a smaller acceleration . A body with a smaller mass moves with a larger acceleration . Newton’s second Law
- 8. For fixed massA body with a smaller net force moves with a smaller acceleration . A body with a larger net force moves with a larger acceleration . Newton’s second Law
- 9. If one bodyexerts a force on another, there is an equal and opposite force, called reaction, exerted on the first body. Newton’s third Law
- 10. Body A exertsa force on body B, then body B exerts an equal and opposite force on body A. Newton’s third Law Body A Body B Force on B by A Force on A by B
- 11.
- 12. Circular Motion inhorizontal circles
- 13. Circular Motion inhorizontal circles Angular velocity = / t Linear velocity v = r Centripetal force F = m r 2 = m v 2 / r Centripetal acceleration a = r 2 = v 2 / r
- 14. Circular Motion inhorizontal circles Conical pendulum
- 15. Circular Motion inhorizontal circles Conical pendulum Do you remember what kind of forces provides the centripetal force to the bob ? Tension T Weight mg Centripetal force
- 16. Vertical circular motion Bucket and water Does the water spill out the bucket when whirling ? If no, why doesn’t it spill out ?
- 17. Vertical circular motion Bucket and water What kind of motion does the bucket perform ? Vertical circular motion What kind of force provides the centripetal force F c to the bucket ? Tension T Weight mg
- 18. Vertical circular motion Bucket and water What kind of force provides the centripetal force F c to the bucket at the highest position ? F c = T + mg Tension T Weight mg
- 19. Vertical circular motion Bucket and water What kind of force provides the centripetal force F c to the bucket at the lowest position ? F c = T - mg Tension T Weight mg
- 20. Vertical circular motion Bucket and water What kind of force provides the centripetal force F c to the water at the highest position ? F c = R + W Reaction of the bucket R Weight of water W
- 21. Vertical circular motion Bucket and water What kind of force provides the centripetal force F c to the bucket at the lowest position ? F c = R - W Reaction of the bucket R Weight of water W
- 22. Vertical circular motion Loop-the-loop
- 23. Vertical circular motion Loop-the-loop What kind of force provides the centripetal force F c to the mass ? The reaction of the track
- 24. Class exercises M.C.Exercise Main menu True or False
- 25. M.C. Question 1Which of the following formula shows Newton’s second Law ? v = r = / t F = ma a = v 2 / r
- 26. M.C. Question 2At which position is the tension on the bucket largest ?
- 27. True or FalseQuestion 1 If the angular velocity of the bucket at the top position is too small, water may spill out. True False
- 28. In the OceanPark , cart coast rider can loop the loop by tension. True or False Question 2 True False
- 29. You are wrong.Try again ! Sorry ！ return
- 30. Congratulation ! Correct! Return