Question 6 — A ball released from point P - Questions at the end of the chapter - Chapter 5 Class 8 - Exploring Forces (Curiosity)

Last updated at July 13, 2026 by

Q 6
Question

A ball is released from point P and moves down an inclined plane and then along a horizontal surface (Fig. 5.16). It stops at point A. Think of a way so that, released from the same point P, it stops (i) before point A, (ii) after crossing point A.

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Answer
Change the friction of the horizontal surface: more friction stops it before A, less friction lets it cross A.

Explanation

  • (i) To stop before A: make the horizontal surface rougher (for example, lay sand or cloth) so friction is greater and the ball stops sooner.
  • (ii) To stop after A: make the surface smoother (for example, polish it) so friction is less and the ball travels farther.
  • Friction is the force that decides how far the ball rolls before stopping.
Rougher surface stops the ball sooner; smoother surface lets it go farther.
← Back to concept: 5.4.1 Contact forces
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