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How Forces Affect Motion — Revision Notes

CBSE · Class 9 · Science

How Forces Affect Motion revision notes for CBSE Class 9 Science: 4 topics in quick points. Part of the CBSE Class 9 Science syllabus.

110 questions72 flashcards5 concepts

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Key Topics to Revise

1

1. Concept of Force

  • Force can make an object move from rest.
  • Force can change the speed of a moving object.
  • Force can change the direction of motion.
2

2. Balanced and Unbalanced Forces

  • When two forces are equal in magnitude and opposite in direction on the same object, they are balanced forces.
  • Balanced forces give zero net force.
  • If net force is zero, acceleration is zero.
3

3. Friction and Motion

  • Friction acts opposite to the direction of motion.
  • Friction opposes the applied force when a box is pushed.
  • Air exerts friction on moving objects, but its magnitude is often negligible.
4

4. Newton's First Law of Motion and Inertia

  • Newton's first law says an object at rest remains at rest and an object in motion continues with constant velocity unless a net force acts on it.
  • Constant velocity means no change in speed or direction.
  • If net force is zero, acceleration is zero.

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Full Notes

Key Concepts

Force can move an object fromEqual forces acting in opposite directionsWhen forces are unequal or actFriction opposes motionAn object at rest remains at

Frequently Asked Questions

What are the important topics in How Forces Affect Motion for CBSE Class 9 Science?
Key topics in How Forces Affect Motion include Concept of Force, Balanced and Unbalanced Forces, Friction and Motion, Newton's First Law of Motion and Inertia. Study these first, then practise questions on each for Class 9 exams.
How should I revise How Forces Affect Motion for Class 9 exams?
Learn the core ideas first, then work through the 110 practice questions on How Forces Affect Motion. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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