Ping-Pong Lab due Monday
List of 10 items in motion with an estimate of their speed/velocity due Monday
Today in class we learned how to add vectors and solve relative motion problems; using arrows to represent direction and speed of motion (velocity, v = speed and direction).
Vectors may be added by drawing vector arrows Tip-to-Tail (the pointed tip of one arrow is the position for the start of the tail of the next)
We worked examples like walking backward (-2 m/s) on a moving bus (8 m/s) and showing with the diagram that the resultant velocity of the person is 6 m/s.
This concept also works on the problem where a ball is thrown (-60 mph) off the back of a moving train (60 mph) and it just drops; its velocity relative to the Earth becomes zero. (an observer on the ground sees the ball drop and fall straight down!)
Most classes also worked problems involving boats crossing rivers (triangles and Pythagorean Theorem) and planes landing or taking off from aircraft carriers.
Since classes were shortened today we didn't get to go over homework (p.92) or do the ranking tasks activity - that will be for Monday.
On Monday I will be assigning a problem set to help everyone practice using speed, distance, and time (plus the velocity concept) and also using vector addition to solve motion problems. This assignment will be due on Wednesday. Want to get a head start: Page 1 Page 2
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