CBSE · Class 8 · Science · Chapter 5

Exploring Forces

Explore contact and non-contact forces, friction, gravity and how forces change the motion or shape of objects.

7 lessons 40 min
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Lessons in this chapter

  1. 1Force as Push, Pull, and InteractionBuild the idea of force from familiar pushes and pulls, then connect force to interaction and changes in motion or shape.
  2. 2Contact Forces: Muscular Force and FrictionExplore forces that require contact, from muscular force to friction between surfaces and through fluids.
  3. 3Non-Contact Forces: Magnetism and Static ChargeInvestigate magnetic and electrostatic forces that can attract or repel without direct physical contact.
  4. 4Gravity and Vertical MotionUse falling and upward-moving objects to understand gravity as an always-attractive non-contact force.
  5. 5Weight, Spring Balance, and MassLearn what weight measures, how a spring balance is read, and why mass stays constant while weight can change.
  6. 6Buoyant Force, Floating, and SinkingUnderstand the upward force exerted by liquids and use it with gravity to explain why objects float or sink.
  7. 7Chapter Summary and PracticeConnect all major ideas about force, friction, non-contact forces, gravity, weight, and buoyancy through mixed reasoning and practice.
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