Investigation 6A: Vector navigation

Essential questionsHow does a robot use vectors to navigate?
Vectors are the fundamental way in which robotic technology operates. Each motion of a robot is described by displacement, velocity, and acceleration vectors. In this investigation you will solve different navigation challenges using two-dimensional vectors to solve a series of mazes.
Part 1: Navigating a maze

Part 1:  Navigating a mazeTo solve the challenge, find a series of vectors that move from the green circle (start) to the red circle (finish) without crossing any of the walls of each maze. You may make up to 20 displacements.
  1. Choose the first maze and try to solve it on the screen with as few vectors as possible.
  2. Choose the second maze. Work out a solution.
  1. What is the minimum number of vectors that can solve each of the four mazes?
  2. What is the minimum total distance you can achieve that solves each of the four mazes?
  3. Maze 4 has a circular path. Do you think more than 20 vectors would allow you to find a solution with a shorter distance? Why or why not? Estimate with your group how much shorter you believe you could get. Could you find a course that is 10% shorter with an unlimited number of vectors? How about 20% shorter?
  4. What changes would you have to make in order for an actual robotic car to navigate a real maze like the ones in the simulation? How will the displacements be different and why?
  5. Discuss how the accuracy and precision of the robotic car’s motion affects the programming needed to successfully solve the maze without hitting a wall.
In this interactive simulation, you will use a series of two-dimensional displacements in order to navigate through a series of mazes.
Part 2: Force, inertia, and a race course

How to use the race course simulation
  1. In this interactive simulation, two players race through a course to the finish line.
  2. During their turns, players may apply a force of 1 N in any direction (or choose zero force instead).
  3. Using the setup button, you may choose a different race course or switch to one-player mode.
  1. How does an upward applied force change the velocity of the cart?
  2. Are there negative forces applied in this activity? Explain.
  3. Explain the role of inertia in this activity.
Read the text aloud
In this interactive simulation you can compete against another student to complete a race course. In each turn, you can apply a one newton force in any of the cardinal directions—or zero force. Watch that you don’t start moving too fast, or you might not be able to turn fast enough to avoid hitting the wall!

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