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Question 1

The following is the distance-time table of an object in motion:
   Time in seconds       Distance in metres
             0                                    0
             1                                    1
             2                                    8
             3                                   27
             4                                   64
             5                                 125
             6                                 216
             7                                 343
(a) What conclusion can you draw about the acceleration? Is it constant, increasing, decreasing, or zero?
(b) What do you infer about the forces acting on the object?

Answer

(a) From the above table, an unequal change of distance in an equal interval of time.

Thus, the acceleration is non − uniform. Since the velocity of the object increases with time, the acceleration is increasing non-uniformly.

(b) According to Newton’s second law of motion, 

Force = mass x acceleration

The force acting on an object is directly proportional to the acceleration produced in the object.

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