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- 1. Chapter 9: Uniform Rectilinear Motion
- 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. Distance and Displacement Distance travelled depends on position. Distance is a scalar quantity. It is always positive. E.g. d = 5 km
- 4. Vector Diagrams
- 5. Activity Page 207, Q1. Orally, Q. 2-5, on paper
- 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. 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. 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. Activity Page Lab 209. Q 1 - 3 Experiment – Can You Walk in a Uniform Way – Ticker Tape
- 10. Graphing Velocity Velocity is considered to be dependent on time. Average velocity = total displacement total time עav = Δd/Δt
- 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. 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. 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. 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. Activity Page 213, Q. 1-5 Page 215, Q 1-4
- 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.

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