Motion in a straight line

• What is the main purpose of motion graphs and numerical values?

  They help in the design of faster and more efficient vehicles.
• What is the definition of distance in motion?

  • Distance is how far an object moves.
  • It does not include direction.
  • It is a scalar quantity.
• How is speed defined in motion?

  Speed is the rate of change of distance.
• What are typical speeds for various methods of travel in metres per second (m/s)?

  • Walking: 1.5 m/s
  • Running: 3 m/s
  • Cycling: 6 m/s
  • Car: 13 - 30 m/s
  • Train: 50 m/s
  • Aeroplane: 250 m/s
• What is a typical value for the speed of sound in air?

  About 330 m/s.
• How can the speed of an object be calculated?

  average speed = distance travelled / time taken
• If a car travels 500 m in 50 s, what is its average speed?

  10 m/s.
• What is the formula to calculate distance travelled at constant speed?

  Distance travelled = average speed × time taken.
• How do you calculate the average speed for a journey involving multiple segments?

  By dividing the total distance by the total time taken.
• What equipment can be used to measure distance and time in a lab setting?

  • Ruler and stopwatch
  • Light gates
  • Video analysis
• What does a ruler measure in speed experiments?

  A ruler measures the distance travelled.
• What does a stopwatch measure in speed experiments?

  A stopwatch measures the time taken.
• How does a light gate work in measuring speed?

  A light gate connects to a timer to give the reading of time taken.
• What is the purpose of video analysis in measuring speed?

  To observe distance moved from frame to frame and know the time between frames.
• What are the key components of calculating speed in experiments?

  • Measure distance travelled
  • Measure time taken
  • Use the formula: speed = distance/time