# UB PHY 101 - Chapter 2: One Dimensional Motion Continued (2 pages)

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## Chapter 2: One Dimensional Motion Continued

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Dr Zhang's lecture notes for chapter 2

- Lecture number:
- 5
- Pages:
- 2
- Type:
- Lecture Note
- School:
- University at Buffalo, The State University of New York
- Course:
- Phy 101 - College Physics

**Unformatted text preview: **

PHY 101 1nd Edition Lecture 5 Outline of Last Lecture II Velocity Speed A Constant Velocity B Varying Velocity C Instantaneous Velocity III Acceleration a Average Acceleration b Instantaneous Acceleration Chapter 2 One Dimensional Motion Continued IV One Dimension Motion With Constant Acceleration V Kinematic Equations VI Free Falling Objects Current Lecture One Dimensional Motion with Constant Acceleration o o o o Velocity changes uniformly linear Example A car has Vo 2 0 m s to the right and accelerates right with a constant a 3 0 m s a what is the velocity at t 10s V Vo at V 2 0 m s 3 0 m s 10s V 32 m s 72 mph B if the car comes to a stop in 3 seconds what s the acceleration 0 32 m s a 10s A 10 67 m s2 Position changes quadratically with time for constant acceleration Example A car at rest has constant acceleration The car travels 10 m in the first 2 seconds What is the displacement from t 0s to t 4s MUST USE TWO STEPS Step 1 x Vot 1 2 at2 x 1 2 at2 10 1 2 a 2 2 These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute A 5 m s2 Step 2 x 1 2 at2 x 1 2 5 4 2 x 40 m Kinematic Equations o For velocity accerlation and displacement V Vo at x Vot 1 2 at2 V2 Vo2 2a x o Example A race car at rest accelerates at a constant rate of 10 m s 2 A what is its velocity Known acceleration displacement Unknown velocity o 2a x v2 Vo 0 1 2 o V 2000 44 7 m s How much time is elapsed after it traveled 100m V Vo at Vo 0 T v a 44 7 10 4 47s 2 6 Free Falling Objects o Neglect air resistance o Free falling object has constant acceleration near Earth s surface G 9 8 m s2 o If it has an initial velocity it has free fall No other forces acting on it o G always points downward o Use y in the positive direction so g is always negative

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