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NCERT Solutions for Curiosity Chapter 5 Exploring Forces

Updated on 2026-09-05

About this chapter

A force is a push or a pull on an object that comes out of the object's interaction with another object . At least two objects must interact for a force to come into play. The SI unit of force is the newton , symbol N . A force can make a resting object move, change the speed of a moving object, change its direction of motion , change its shape , or produce several of these effects together. None of these changes happens without a force. Contact forces act only when the surfaces touch — muscular force and the force of friction . Friction arises from the irregularities of the two surfaces locking into each other, always acts opposite to the motion (or attempted motion), and is greater on rough surfaces. Non-contact forces act across a gap — magnetic force , electrostatic force and gravitati

  • Chapter opener
  • .1 What Is a Force?
  • .3 Are Forces an Interaction Between Two or More Objects?
  • .4.1 Contact forces
  • .4.2 Non-contact forces
  • .5 Weight and Its Measurement (Fig. 5.12)
  • .5 Weight and Its Measurement
  • .5 Weight and Its Measurement · Table 5.2 (Fig. 5.14)
  • .6 Floating and Sinking
  • .6 Floating and Sinking (Fig. 5.15)
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Exercises

  1. Chapter opener — Probe and ponder Page 62
  2. .1 What Is a Force? — Activity 5.1: Let us explore Page 635
  3. .2 What Can a Force Do to the Objects on Which It Is Applied? · Table 5.1 — Activity 5.2: Let us analyse Page 645
  4. .2 What Can a Force Do … · 5.3 Are Forces an Interaction Between Two or More Objects? — In-text Questions Page 655
  5. .3 Are Forces an Interaction Between Two or More Objects? — A step further Page 655
  6. .4 What Are the Different Types of Forces? · 5.4.1 Contact forces — A step further Page 665
  7. .4.1 Contact forces — In-text Questions Page 675
  8. .4.1 Contact forces — Activity 5.3: Let us investigate Page 675
  9. .4.1 Contact forces — Activity 5.4: Let us explore Page 685
  10. .4.1 Contact forces — In-text Questions Page 685
  11. .4.1 Contact forces — A step further Page 685
  12. .4.2 Non-contact forces — In-text Questions Page 695
  13. .4.2 Non-contact forces — Activity 5.5: Let us test Page 695
  14. .4.2 Non-contact forces — Activity 5.6: Let us experiment Page 705
  15. .4.2 Non-contact forces — Activity 5.7: Let us experiment Page 705
  16. .4.2 Non-contact forces — In-text Questions Page 715
  17. .4.2 Non-contact forces — Activity 5.8: Let us observe Page 715
  18. .4.2 Non-contact forces — In-text Questions Page 725
  19. .5 Weight and Its Measurement (Fig. 5.12) — Activity 5.9: Let us explore Page 735
  20. .5 Weight and Its Measurement — Activity 5.10: Let us observe Page 735
  21. .5 Weight and Its Measurement — Activity 5.11: Let us calculate Page 745
  22. .5 Weight and Its Measurement · Table 5.2 (Fig. 5.14) — Activity 5.12: Let us measure Page 745
  23. .5 Weight and Its Measurement — In-text Questions Page 755
  24. .6 Floating and Sinking — In-text Questions Page 765
  25. .6 Floating and Sinking (Fig. 5.15) — Activity 5.13: Let us investigate Page 765
  26. Chapter-end exercise, Questions 1–10 — Keep the curiosity alive Page 77
  27. Interdisciplinary projects — Discover, design, and debate Page 79
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