2.2 Distance, time and Speed

• explain the terms distance, time and speed in real life
• determine speed and velocity in real life situations
• determine acceleration of an object in motion
• compute relative motion of two bodies moving in the same and opposite direction
• apply relative motion in real life situations
• appreciate the importance of relative motion in day to day life

“Why is speed important in real life?”

“How is relative motion applicable in real life?”

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1. Distance, time and speed
   40 min · 1 practice tasks · quiz
   Relate distance, time and speed, and use speed = distance / time.
2. Average speed and unit conversion
   40 min · 1 practice tasks · quiz
   Convert between km/h and m/s and find an average speed.
3. Distance and displacement
   40 min · 1 practice tasks · quiz
   Tell distance from displacement and speed from velocity, using direction.
4. Acceleration and slowing down
   40 min · 1 practice tasks · quiz
   Find acceleration from a change of velocity and read a negative answer as slowing down.
5. Two vehicles, same direction
   40 min · 1 practice tasks · quiz
   Find the closing speed of two bodies moving the same way and the time to catch up.
6. Two vehicles, opposite directions
   40 min · 1 practice tasks · quiz
   Find the closing speed of two bodies moving towards each other and the time to meet.
7. A journey in two parts
   40 min · 1 practice tasks · quiz
   Find the average speed of a journey made in two parts with different speeds and times.
8. Speed, overtaking and road safety
   40 min · 1 practice tasks · quiz
   Use relative motion to compare same-direction and head-on approaches and value safe speeds.