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Lesson 9 – Problem Solving with Relative Motion

Lesson 9 – Problem Solving with Relative Motion. August 12, 2013. Learning Goals. The student will learn effective problem solving tactics in physics The student will be able to solve problems related to relative motion, by adding and subtracting vector quantities by using a variety of methods.

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Lesson 9 – Problem Solving with Relative Motion

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  1. Lesson 9 – Problem Solving with Relative Motion August 12, 2013

  2. Learning Goals • The student will learn effective problem solving tactics in physics • The student will be able to solve problems related to relative motion, by adding and subtracting vector quantities by using a variety of methods

  3. Frames of Reference, Level Up • Relative Motion Video

  4. Relative motion of a Ball, Ship and Water • All motion is relative • General Case:

  5. Fernando’s Favourite • A train has a speed of 20 km/h. Raindrops falling against its side windows make traces inclined at 30 to the vertical. We ignore air turbulence and there is no wind. • A) What is the horizontal component of a raindrop’s velocity with respect to the Earth? With respect to the train? • Ans. 0, -20 km/h • B) What is the velocity of the raindrop with respect to the Earth? With respect to the train? • Ans. – 35 km/h j, 40 km/h [S30  W]

  6. More on Rain • A car travels due east with a speed of 60.0 km/h relative to the ground. Raindrops are falling at a constant speed vertically relative to Earth. The traces of the rain on the side windows of the car make an angle of 70.08° with the vertical. Calculate the velocity of the rain relative to: • the car and • Earth.

  7. Legacy of Excellence • A person walks up a stalled-escalator in a department store in 90 s. When standing still on the same escalator in motion, he is carried up in 60 s. How much time would it take him to walk up the moving escalator? Could he walk down the escalator while it was moving up? (Sir Isaac Newton Contest)

  8. Airport Moving Sidewalk • When the moving sidewalk at the airport is broken, as it often seems to be, it takes you 50 s to walk from your gate to baggage claim. When it is working and you stand on the moving sidewalk the entire way, without walking, it takes 75 s to travel the same distance. How long will it take you to travel from the gate to baggage claim if you walk while riding on the moving sidewalk?

  9. Further Explanations • Physics Classroom: Relative Velocity • A Plus Physics: • Relative Velocity and Riverboat Problems • The Plane and the Wind

  10. Ferry Boat A large ferry boat is moving north at 4.0 m/s [N] with respect to the shore, while a child is running on the deck at a speed of 3.0 m/s. Determine the velocity of the child relative to Earth when the child is running in the following directions with respect to the deck of the boat: (a) north (b) south (c) east

  11. Required Before Next Class • Read Section 2.1 • Complete the Relative Motion Questions • Add me on Facebook, Peter Bishop

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