Question 6 — The position-time graph for four - Questions at the end of the chapter - Chapter 6 - How Forces Affect Motion (Exploration)

Last updated at July 16, 2026 by

The position-time graph for four objects A, B, C and D moving along a straight line are given in Fig. 6.37. A net force acts on:
(i) Object A
(ii) Object B
(iii) Object C
(iv) Object D
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The correct option is (iii) Object C.

A (straight sloping line) and D (straight line) show constant velocity, and B (flat line) is at rest — all have zero net force. Only C has a curved position-time graph, meaning its velocity is changing, so a net force acts on it.

Reading the four position-time graphs
Object Shape of the graph Motion Net force?
A straight sloping line constant velocity No
B flat, parallel to time axis at rest No
C curved line velocity is changing — accelerating Yes
D straight line sloping down constant velocity, backwards No
Answer — — (iii) Object C
← Back to: 6.4 Newton's First Law of Motion
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