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Newton’s Law

Newton’s Law. Change: ----motion Two questions: ● How do we describe motion? We want to analyze the motion mathematically The mathematical description of motion is called kinematics. ● How do we explain motion? The explanation of motion in terms of its causes is called dynamics.

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Newton’s Law

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  1. Newton’s Law Change: ----motion Two questions: ● How do we describe motion? We want to analyze the motion mathematically The mathematical description of motion is called kinematics. ● How do we explain motion? The explanation of motion in terms of its causes is called dynamics.

  2. Concepts of Motion • 1.1 Motion Diagrams • 1.2 The Particle Model • 1.3 Position and Time • 1.4 Velocity • 1.5 Acceleration • 1.6 Examples of Motion Diagrams • 1.7 From Words to Symbols

  3. Suggest to practice: Stop to think 1.1 P5 Stop to think 1.2 P6 Stop to think 1.3 P13 Stop to think 1.4 P15 Stop to think 1.5 P28 Example 1.2 P 12 Example 1.4 P 16 Example 1.6 P 17 Example 1.8 P 22 Example 1.9 P 23 Example 1.10 P 27

  4. 1.1 Motion Diagram • Motion is defined as the change of an object’s position with time • The right picture is showing a car positions at several equally spaced instants of time. It is motion diagram

  5. I Object moving with constant speed Ball slowing down as it rises And speeding up as it falls

  6. 1.2 Particle Model Particle model of motions is a simplification in which we treat a motion object as if all of its mass were concentrated at a single point.

  7. 1.3 Position and Time

  8. Change in Position

  9. Vector and Vector addition

  10. Application to Motion Diagrams

  11. Velocity In Physics the distinction between speed and velocity is very important. Speed is scalar (how fast); velocity Is vector (how fast and in which direction).

  12. Motion diagrams with velocity vector

  13. Motion diagram of a ball The average velocity vectors are found by connecting to dots with arrows.

  14. Relating position to velocity

  15. Acceleration • Average acceleration

  16. A particle undergoes acceleration which moving from 1 to point 2. Which of the choice shows the velocity

  17. Examples of Motion Diagrams • Please practice examples 1.4---1.8 (page 18—20). Example 1.4 Skiing through the wood

  18. Position vs time graphs

  19. From Words to Symbols • Sketch the situation • Establish a coordinate system • Define symbols. ex. • List known information Some quantities are implied by the problem, rather than explicitly given. Others are determined by your choice of coordinate system. ●Identify the desired unknowns

  20. Units and significant figures • Three basics SI unit

  21. Convert the following to SI units • 60mi/h = • Alcohol mass density 0.81g/cm3 =

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