Physics day5b


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PSHS 3rd Year Physics
Batch 2013

Circular Motion
Terms in kinematics
Uniform Circular Motion
Non uniform Circular Motion
Rotational Motion
Force (Centripetal & Tangential)
Acceleratio (Centripetal & Tangential)

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Physics day5b

  1. 1. PHYSICSPSHS 3RD YEAR<br />Session 5<br />
  2. 2. TUTORIAL REMINDERS<br />2 Hours today<br />Be ready with your:<br />Sci. calculator<br />Physics notes<br />Session 4 handout<br />Paper<br />Pen<br />Today’s Flow:<br />CIRCULAR MOTION<br />1.) Review of terms<br />2.) PinoyHenyo<br />3.) Self-check exercises<br />4.) Challenge exercises<br />
  3. 3. Answers: Terms<br />1.Directed radially toward the center<br />CENTRIPETAL<br />2. Constant speed along a straight line<br />UNIFORM VELOCITY<br />3. Angular displacement divided by time t<br />ANGULAR VELOCITY<br />
  4. 4. Answers: Terms<br />4.The direction of the linear velocity of an object in circular motion<br />TANGENTIAL<br />5. Movement of an object in a circle experiencing uniform speed<br />UNIFORM CIRCULAR MOTION<br />6. Directed distance (distance where direction is important)<br />DISPLACEMENT<br />
  5. 5. Answers: Terms<br />7.What is done to curved roads to reduce skidding<br />BANKING<br />8. What an object experiences when there is a change in the magnitude of its velocity (speed), or a change in its direction of motion<br />ACCELERATION<br />
  6. 6. Circular Motion<br />
  7. 7. Does an object in uniform circular motion have constant velocity?<br />No. Constant speed but constant changing direction of motion. Thus, velocity is NOT constant.<br />
  8. 8. Uniform Circular Motion<br />Since the object is in constant speed BUT continuously changing direction – there is acceleration.<br />What causes this acceleration and movement in a circle?<br />The NET FORCE is directed towards the center, and keeps the object in a circular motion.<br /><ul><li>Answer page 3 Centripetal Force #s 1-5,
  9. 9. Page 4 problem 4.</li></li></ul><li>Non-Uniform Circular Motion<br />If the net force is NOT directed towards the center but at an angle, the net force has 2 components! <br />
  10. 10. EX.4 (page 111, Giancoli)<br />A 0.150-kg ball on the end of a 1.10m-long cord (negligible mass) is swung in a VERTICAL CIRCLE. Determine the minimum speed the ball must have at the top of its arc so that the ball continues moving in a circle.<br />
  11. 11. What’s the difference?<br />TANGENTIAL FORCE Ftan<br />Acts to INCREASE or DECREASE the speed of the object<br />CENTRIPETAL FORCE FR<br />Keeps object moving in a CIRCLE<br />
  12. 12. Non-Uniform Circular Motion<br />TANGENTIAL acceleration – the direction of the tangential acceleration is in the direction of the change in velocity<br />
  13. 13. Non-Uniform Circular Motion<br />Total vector acceleration a<br />Magnitude of total vector a <br />Direction of total vector a<br />Resultant vector of aR and atan<br />
  14. 14. A race car starts from rest in the pit area and accelerates at a uniform rate to a speed of 35 m/s in 11 sec, moving on a circular track of radius 500m. Assuming constant tangential acc’n, find a.) Tangential acc’nb.) Radial acc’n, at the instant when the speed v is 15 m/s.<br />
  15. 15. Law of Universal Gravitation<br />(Adapted from Page 119, Giancoli)<br />Tyrone and Mia have masses of 50 kg and 75 kg respectively. They sit 1.0 m apart in the front center of their Physics class. Estimate the magnitude of the gravitational force each exerts on the other.<br />
  16. 16. ROTATIONAL MOTION<br />
  17. 17. Rotational Motion<br />All points in the object move in circles.<br />The centers of these circles all lie in a line called the axis of rotation.<br />Where <br />