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Question · Revise, Reflect, Refine, Q6, page 113
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
![Question 6 — The position-time g - How Forces Affect Moti - [Teachoo] - Questions at the end of the chapter](https://cdn.teachoo.com/9b684512-bcb4-4e96-87c7-c4c9fa1dee79/animation-for-the-position-time-graph-for-four-objects-a-b-c-and-d-moving-along-a-straight-line-are-given-in-fig.-6.3.gif)
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Answer
| Object | What its position-time graph shows | Is the velocity changing? |
|---|---|---|
| A | Position rises steadily, a straight slanting line | No, constant velocity |
| B | Position does not change, a flat line | No, the object is at rest |
| C | Position rises faster and faster, a curved line | Yes, the velocity is changing |
| D | Position falls steadily, a straight slanting line | No, constant velocity in the opposite direction |
- A net force is needed only where the velocity is changing.
- Only C has a changing velocity.
- Answer: (iii) Object C
