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Unformatted text preview: 1 1 Topic 6: Kinematics • Describing motion • Position and displacement • Velocity • Acceleration • Free Fall 2 Describing motion (1.Motion Diagrams,2.Graphs,3.Equations); Position and displacement; Velocity; Acceleration; Free Fall • Kinematics describes the motion of an object. • Answers the questions “where?” and “when?” but not “why?”. • The answers can be done – Verbally – In motion diagrams – In graphs – In equations 3 Describing motion( 1.Motion Diagrams, 2.Graphs,3.Equations); Position and displacement; Velocity; Acceleration; Free Fall 1. Motion Diagrams: – Shows location of an object at different times. – Constant time intervals between snapshots. – Like showing a movie frameby frame 2 4 A B C D None of the above Which motion diagram shows an object speeding up? Question 5 A B C D None of the above Which motion diagram shows a stationary object (at rest)? Question 6 A B C D None of the above Which motion diagram shows an object moving with a constant speed? Question 3 7 A B C D None of the above Which motion diagram shows an object slowing down? Question 8 Describing motion(1.Motion Diagrams, 2.Graphs, 3. Equations); Position and displacement; Velocity; Acceleration; Free Fall • From Motion Diagrams to Graphs – The video camera takes a pictures with a constant time interval: 15 frames per second. – This allows to show the history of a motion and study it as a function of time. – In your labs, the motion sensor also transmits the position of an object to the computer with constant time intervals. 9 Describing motion(1.Motion Diagrams, 2.Graphs, 3. Equations); Position and displacement; Velocity; Acceleration; Free Fall 2. Graphs: – More precision, easier to read but more abstract. – The graph shows the time explicitly, allows to extract mathematical description of position as a function of time. 4 10 Describing motion(1.Motion Diagrams, 2.Graphs, 3. Equations); Position and displacement; Velocity; Acceleration; Free Fall • The Particle Model of Motion: – Rigid’ objects are treated as a point in space. – The object is characterized by just one number, its mass m. – So cars, trains, airplanes, humans, atoms, planets,…just a point in space. – (This representative point is usually the centre of mass.) 11 Describing motion(1.Motion Diagrams, 2.Graphs, 3. Equations); Position and displacement; Velocity; Acceleration; Free Fall • Reference Frames: – The motion of a physical object is always described within a certain...
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 Spring '09
 Lioudmila
 Acceleration, Velocity, Vavg

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