Page 80 - CT&AI_CLasa_7_Part_1

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)