RP7

• What is the method for measuring reaction time in this practical?

  • Two people work together
  • Person 1 sits upright on a stool
  • Person 1's dominant arm is placed over the table
  • Person 2 holds a ruler vertically
  • Ruler is dropped randomly
  • Person 1 catches the ruler
  • Measurement is recorded
  • Test is repeated and mean calculated
• What position should person 1 be in during the test?

  Upright on a stool
• How should person 2 hold the ruler before dropping it?

  Vertically with zero mark between fingers
• What should person 1 do when the ruler is dropped?

  Catch it with thumb and first finger
• What is recorded after person 1 catches the ruler?

  The measurement at the top of the thumb
• Why is it important for person 1 to have a short rest between tests?

  To avoid fatigue affecting results
• What is the independent variable in this experiment?

  The person having their reaction time tested
• What is the dependent variable in this experiment?

  The reaction time
• What are the control variables in this experiment?

  • Distance between thumb and finger
  • Measurement at the top of the thumb
  • Consistent room conditions (lighting, noise)
• What could happen if control variables change?

  It could affect the reaction time measured
• What are some other independent variables that could be investigated?

  • Effect of practice on reaction time
  • Hand used to catch the ruler
  • Effect of chemicals like caffeine
• How could practice affect reaction time?

  It might shorten reaction time with more tries
• How can the effect of hand dominance be tested?

  By testing both dominant and non-dominant hands
• How can caffeine's effect on reaction time be tested?

  By comparing reaction times after consuming cola
• What should be checked before giving subjects caffeine?

  Medical issues that might be affected
• Where should the test be conducted?

  In a lab without hazardous chemicals
• What resources are available for further questions on this practical?

  • Vision workbook
  • Link provided in the video
• Why is it important to learn the details of the practical?

  It's a required practical for understanding
• What is the significance of random timing in dropping the ruler?

  It prevents anticipation of the drop
• Why is it necessary to conduct multiple trials?

  To calculate an accurate mean reaction time
• How does hand dominance potentially affect reaction time?

  Dominant hand may have shorter reaction time
• What safety considerations should be taken when testing with caffeine?

  Check for allergies or heart conditions