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Announcements. Homework for tomorrow… (Ch. 5, Probs. 47 & 55 ) 5.22 a) yes b) 0.13 m above c) no d) 0.85 m below Office hours… M 3-4 pm TWR 9-10 am F 1-2 pm Tutorial Learning Center – Houston Hall 113 MWR 8 am-6 pm T 8 am-7 pm

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  1. Announcements Homework for tomorrow… (Ch. 5, Probs. 47 & 55 ) 5.22 a) yes b) 0.13 m above c) no d) 0.85 m below Office hours… M 3-4 pm TWR 9-10 am F 1-2 pm Tutorial Learning Center – Houston Hall 113 MWR 8 am-6 pm T 8 am-7 pm F 8 am-5 pm

  2. Chapter 5

    Net Force and 2D Motion (Uniform Circular Motion)
  3. Review… Average Velocity , Instantaneous Velocity Average Acceleration, Instantaneous Acceleration The magnitude of Centripetal Acceleration is
  4. Centripetal Acceleration For constantv…
  5. Tangential & Centripetal Acceleration For an increasingv… What is the magnitude of the total acceleration?
  6. Quiz Question 1 An object moves in a circular path with constant speed v. Which of the following statements is true concerning the object? Its velocity is constant, but its acceleration is changing. Its acceleration is constant, but its velocity is changing. Both its velocity and acceleration are changing. Its velocity and acceleration remain constant.
  7. Centripetal Force - Any force that causes circular motion Direction: towards the center of the circle Magnitude: - Newton’s 2nd Law
  8. Concept Questions What supplies the centripetal force for… a ball on a string whirled around in a circle? a satellite in orbit? a car racing on a circular track?
  9. Example 1 A bored astronaut in outer space twirls a ball on a string whirled around at constant speed in a circle. The length of the string is 30 cm, the mass of the ball is 50 g. The time needed to complete one revolution is .75 s What is the tension in the string?
  10. Example 2 A bored astronaut on Earth twirls a ball on a string whirled around at constant speed in a circle. The length of the string is 30 cm, the mass of the ball is 50 g. The time needed to complete one revolution is .75 s What is the tension in the string when the ball is at the bottom of the path? What about the top of the path?
  11. “Weightlessness” implies what? n mg
  12. Artificial Gravity One way… Another way… “2001: A Space Odyssey” a = 9.8 m/s2 r v
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