Force and Laws of Motion Class 9 Summary
20 Questions
4 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

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.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    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.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser