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# Physics 504 Chapter 9 Uniform Rectilinear Motion

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### Physics 504 Chapter 9 Uniform Rectilinear Motion

1. 1. Chapter 9: Uniform Rectilinear Motion
2. 2. Types of Motion Rectilinear: Motion in a straight line path. E.g. an elevator. Curvilinear: Motion in a curved path. A ball being thrown. Random: A combination of the above. A leaf in the wind.
3. 3. Distance and Displacement  Distance travelled depends on position.  Distance is a scalar quantity.  It is always positive.  E.g. d = 5 km
4. 4. Vector Diagrams
5. 5. Activity  Page 207, Q1. Orally,  Q. 2-5, on paper
6. 6. Uniform Motion  The simplest motion is straight line motion in a specific direction at a constant speed.  When both speed and direction remain the same, it is called uniform motion.  Speed is a scalar quantity, = distance/time.  Velocity is the vector quantity denoting speed and direction.  Velocity is the displacement of an object per unit of time.  V = Δd/Δt, Δd - displacement, Δt – time interval.
7. 7. Random Motion  The motion of these particles are random because their speed and direction change.  This is an example of the Kinetic Molecular Theory (Chemistry).
8. 8. Graphing Distance-Time  Time is independent and on the x-axis.  Distance depends on time and is on the yaxis.  The slope of the graph gives us the speed.  If it was a displacement-time graph, slope would give the velocity.
9. 9. Activity  Page  Lab 209. Q 1 - 3 Experiment – Can You Walk in a Uniform Way – Ticker Tape
10. 10. Graphing Velocity  Velocity is considered to be dependent on time.  Average velocity = total displacement total time  ‫ע‬av = Δd/Δt
11. 11. Average Velocity & Speed  This is done by taking the slope of a line at two different points.  Average velocity = ∆ displacement ∆ time  Unit = m/s [direction]  Average speed = ∆ distance ∆ time  Unit = m/s
12. 12. Average Velocity: Uniform Acceleration  Average Velocity during uniform acceleration can be calculated by taking the mean of 2 velocities.  vavg = v2 + v1 2 P. 209, Q 1-3
13. 13. Distance & Speed  We already know that speed = distance  time  So distance = speed x time  Distance can be determined by the area under the curve of a velocity-time graph.
14. 14. Exam Question  What is the displacement after 25 s? Velocity (m/s) 20 15 10 5 0 -5 0 5 10 15 20 25 30 -10 -15 Time (s)
15. 15. Activity  Page 213, Q. 1-5  Page 215, Q 1-4
16. 16. Summary  Some motions can be seen easily; other motions must be observed using other senses or devices.  The trajectory is the path of a moving object.