Answer Key: Taking Turns_Unit Level_Quiz

Submitted by Randy Steele on 15 July, 2011 - 20:17

 

Answer Key: Unit Quiz

  1. A Point Turn has one wheel going forward and the other going backward at the same speed  this causes the robot to turn a point located at the center of the axle between the wheels).  This is accomplished in NXT-G by sliding the Steering control to one extreme or the other. 
  2. A Swing Turn has one wheel stopped and the other moving (this causes the robot to swing , or pivot, around one stopped wheel).  This is accomplished in NXT-G by using two Move blocks; a first Move block used to stop the pivot wheel /motor (unless this is known to already stopped, e.g. at the beginning of program, or after another limited duration Move block) and the second Move block is used to move the turning wheel/motor.
  3. A U-Turn has both wheels moving forward, but at different speeds (this causes the robot to turn in a U-shape).  This is accomplished in NXT-G by sliding the Steering control off the center and to any position, except the extreme ends (the further off-center, the sharper the turn).
  4. The Move Block command turns the motor (not the robot) 90 degrees.
  5. 1) Guess-and-check
    2) Ratio and Proportion
    3) Unit Rate
    4) View Mode
     
  6. A) Which Motor is being controlled
    B) Which Direction (or stopped) the motor will turn
    C) Constant (apply full power immediately), or Ramp Up or Down (slowly adjust power to specified setting).
    D) Power Level for Motor
    E) Automatically increase motor power toward 100%  if motor starts becoming stuck
    F) How long/far (or unlimited) the motor should run
    G) Wait until specified motor movement is complete before moving to next block in program
    H) Stop abruptly or remove power and allow motor to slowly coast to  stop
  7. When an immediate application of full power might cause the motor to slip.  For example, wheels on a soft or loose surface
  8. When the motor is driving a heavy load.  For example, a lifting arm or wheels moving up a ramp
  9. 1)  Motor Power Control available
    2) Action parameter available
    3) No Wait-for-Completion when a fixed duration is set (rotations, degrees, or seconds)
    4) Using two Motor blocks to control steering (rather than the course Move block slider) gives finer steering control
    5) Motor blocks take up less space in the NXT memory