September 29, 1998 Comments about the test

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Presentation transcript:

September 29, 1998 Comments about the test Can’t discuss actual problems yet except by email I can view your answers and give credit Gave same test to my P5 class... They had 1 1/2 hrs, half closed-book… one H.S. student got 95. What is on WEB… schedule, exploratories

September 29, 1998 2 Laws of Falling Bodies… Aristotle vs Galileo coffee filters, films, interactive physics Patterns on earth and moon When is a body “freely falling”? The basic concepts of kinematics… Position relative to reference frame (x) Velocity… Acceleration...

September 29, 1998 3 Position… shown every second. 0 1 2 3 4 5 6 7 8 9 10 11 Position (m) (m) P O S I T N 12 10 8 6 4 2 0 1 2 3 4 5 Time (s)

September 29, 1998 4 Velocity measures the change in Position during a change in time VELOCITY = Change in Position Change in Time Go back to graph to see velocity on a Position-time graph ….. SLOPE

September 29, 1998 5 Computing the average velocity of a trip Each group will compute result… A driver drove for 2 1/2 hours at 60 miles per hour, stopped for 1 hour, then drove at 40 miles/hour for 1 hour, stopped for 15 minutes, then went 60 miles in 75 minutes. What is the average velocity for the trip?

September 29, 1998 6 Putting the trip on a graph Velocity as a function of time…. Position as a function of time… When the velocity changes… we have ACCELERATION ACCELERATION = change in velocity m/s change in time s

September 29, 1998 7 Observing Accelerations (Interactive Physics) Falling Objects (a look at V, A) Inclined Planes Pendulum Ellipse Parabola (Projectile Motion) Highway Roller Coaster