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9. FRICTION

Friction is a force that opposes the relative motion between two surfaces in contact. It plays an essential role in various daily activities and applications, as it can both facilitate movement and hinder it depending on context. Understanding the factors affecting friction, its types, and how it can be increased or reduced is crucial in numerous fields, from sports to engineering.

Sections

  • 9

    Friction

    Friction is a force that opposes the motion between two surfaces in contact, influenced by surface roughness and the force pressing them together.

    Learning Practice

  • 9.1

    Force Of Friction

    This section introduces the concept of friction, explaining how it opposes motion and factors that affect it.

    Learning Practice

  • 9.1.1

    Activity 9.1

    This section introduces the concept of friction, explaining its role in opposing motion and its dependence on surface characteristics.

    Learning Practice

  • 9.2

    Factors Affecting Friction

    This section explores the factors that influence friction, including surface texture and applied force.

    Learning Practice

  • 9.2.1

    Activity 9.2

    The section discusses factors affecting friction, exploring how different surfaces influence the force of friction experienced by objects.

    Learning Practice

  • 9.2.2

    Spring Balance

    This section explains the concept of friction and introduces spring balances as tools to measure forces.

    Learning Practice

  • 9.2.3

    Activity 9.3

    This section discusses the role of friction and how different surfaces affect motion.

    Learning Practice

  • 9.3

    Friction: A Necessary Evil

    This section discusses the dual nature of friction as both a necessary force for movement and a source of challenges in daily activities.

    Learning Practice

  • 9.4

    Increasing And Reducing Friction

    This section explores the importance of friction in various contexts, including how to increase or decrease it based on specific needs.

    Learning Practice

  • 9.4.1

    Activity 9.4

    This section explores how the application of different forces affects the movement of objects on various surfaces.

    Learning Practice

  • 9.5

    Wheels Reduce Friction

    This section explains how wheels reduce friction compared to sliding, highlighting the significance of rolling friction in everyday objects and machinery.

    Learning Practice

  • 9.6

    Fluid Friction

    Fluid friction is the resistance experienced by objects moving through gases and liquids, affecting their motion and energy.

    Learning Practice

  • 9.7

    Keywords

    This section outlines key terms related to the principles of friction, including various types and factors influencing frictional force.

    Learning Practice

  • 9.8

    What You Have Learnt

    This section encapsulates key learning points about friction, its types, factors affecting it, and its importance in everyday life.

    Learning Practice

  • 9.9

    Exercises

    This section provides exercises aimed at reinforcing the concepts of friction, its types, and the factors affecting it.

    Learning Practice

  • 9.10

    Extended Learning — Activities And Projects

    This section discusses various activities and projects related to friction.

    Learning Practice

References

NCERT Study Material

Class Notes

Memorization

What we have learnt

  • Friction opposes the relati...
  • Friction depends on the nat...
  • Static friction is greater ...

Final Test

Revision Tests

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