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    Measurement of

                                     8                                       Time and Motion

                                               computational thinking quest

                    Tick ( ) the correct option.
                      1.  A delivery driver needs to reach a customer                               (Algorithmic Thinking)
                         15 km  away  in 30  minutes. What  average                 (a)   Uniform — the object always
                         speed  must  the  driver maintain  to  arrive
                         exactly on time?         (Abstract Thinking)                  moves, so speed is constant;
                                                                                                        60
                                                                                       average speed =      m/s
                                (a)  30 km/h        (b)  45 km/h                                        70
                                                                                    (b)  Non-uniform —
                                (c)  15 km/h        (d)  60 km/h                       average speed =  60  ≈ 0.86m/s
                                                                                                        70
                      2.  An object's  motion data  is recorded:                    (c)   Non-uniform — but average speed
                         Distance (m): 0, 6, 21, 29, 35, 42, 45, 60 at                 cannot be calculated without a
                         Time (s): 0, 10, 20, 30, 40, 50, 60, 70. Rajan                graph.
                         says:  'The object  covers distance,  so  it  has
                         uniform  speed.' Meera  calculates  speed  for             (d)   Uniform — the total distance divided
                         each  10-second interval and finds different                  by total time gives constant speed
                         values. She concludes  the motion  is non-                    throughout.
                         uniform.
                                                                           3.  A car travels for 1 hour in heavy traffic. The
                          60                                                  speedometer keeps changing between 0 and
                                                                              40 km/h, but the odometer shows an increase
                          50
                                                                              of only 15 km. What does this indicate?
                         Distance (metres)  30                                      (a)   The  car moved with constant
                          40

                                                                                                    (Pattern Recognition)

                          20
                                                                                       speed.
                          10
                                                                                    (b)   The car had non-uniform speed
                                                                                       with frequent stops.
                           0    10   20   30  40   50   60   70  80
                                         Time (seconds)
                                                                                    (c)   The odometer is faulty.
                         What is the speed in each 10-second interval,
                         is the motion  uniform or non-uniform,  and                (d)   The car did not move at all.
                         what is the average speed?

                     78        Computational Thinking-7 (Science)

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