Force and Laws of Motion Class 9 Summary
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Force and Laws of Motion Class 9 Summary

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Questions and Answers

What is a force that always opposes the motion of objects called?

  • Magnetic force
  • Electric force
  • Frictional force (correct)
  • Gravitational force

    • What is the SI unit of force?

  • Joule
  • Newton (correct)
  • Watt
  • Volt

    • When are forces said to be balanced forces?

  • When they are in the same direction
  • When they cause acceleration
  • When they have different magnitudes
  • When they nullify each other and their resultant force is zero (correct)

    • What does a force consist of?

    <p>Both magnitude and direction</p> Signup and view all the answers

    What does a force do to an object it acts upon?

    <p>Produces acceleration</p> Signup and view all the answers

    What is the product of mass and velocity known as?

    <p>Momentum</p> Signup and view all the answers

    In the formula F = ma, what does 'F' represent?

    <p>Force</p> Signup and view all the answers

    What is the SI unit of momentum?

    <p>kg m/s</p> Signup and view all the answers

    What is the natural tendency of an object to resist a change in its state of rest or of uniform motion called?

    <p>Inertia</p> Signup and view all the answers

    According to the law of conservation of momentum, what happens to the sum of momenta of two objects before and after collision?

    <p>It remains constant</p> Signup and view all the answers

    What is the SI unit of momentum?

    <p>kg m/s</p> Signup and view all the answers

    According to the second law of motion, what is the relationship between the rate of change of momentum and the applied unbalanced force?

    <p>Directly proportional</p> Signup and view all the answers

    What is the natural tendency of an object to resist a change in its state of rest or of uniform motion called?

    <p>Inertia</p> Signup and view all the answers

    What is the formula for momentum?

    <p>$mv$</p> Signup and view all the answers

    In the law of conservation of momentum, what happens to the total momentum of a system if the external force on the system is zero?

    <p>Remains constant</p> Signup and view all the answers

    What is the SI unit of force?

    <p>Newton</p> Signup and view all the answers

    What is the natural tendency of an object to resist a change in its state of rest or of uniform motion called?

    <p>Inertia</p> Signup and view all the answers

    What is the product of mass and acceleration known as?

    <p>Force</p> Signup and view all the answers

    When are forces said to be balanced forces?

    <p>When their resultant force is zero</p> Signup and view all the answers

    What is the force that always opposes the motion of objects called?

    <p>Friction</p> Signup and view all the answers

    Study Notes

    Forces and Motion

    • A force that always opposes the motion of objects is called friction.
    • The SI unit of force is the Newton (N).

    Balanced Forces

    • Forces are said to be balanced forces when they result in no net force or acceleration on an object.

    Force and Momentum

    • A force consists of a push or pull that causes an object to change its motion.
    • A force acting on an object causes it to change its velocity, i.e., accelerate.
    • The product of mass and velocity is known as momentum.

    Formulae

    • The formula F = ma represents force (F), mass (m), and acceleration (a).
    • In the formula F = ma, 'F' represents force.
    • The formula for momentum is p = mv, where p is momentum, m is mass, and v is velocity.

    Momentum and Conservation

    • The natural tendency of an object to resist a change in its state of rest or of uniform motion is called inertia.
    • According to the law of conservation of momentum, the sum of momenta of two objects before and after collision remains the same.
    • The SI unit of momentum is the kilogram-meter per second (kg·m/s).
    • If the external force on a system is zero, the total momentum of the system remains constant.

    Second Law of Motion

    • According to the second law of motion, the rate of change of momentum is proportional to the applied unbalanced force.

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    Access summary and revision notes for Class 9 Science Chapter 9 on Force and Laws of Motion. These CBSE notes include key points, revision notes, images, and diagrams for comprehensive understanding of the chapter. Ideal for students using NCERT Textbook for Science.

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