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 (C)</p> Signup and view all the answers

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

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

What is the product of mass and velocity known as?

<p>Momentum (D)</p> Signup and view all the answers

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

<p>Force (B)</p> Signup and view all the answers

What is the SI unit of momentum?

<p>kg m/s (A)</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 (A)</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 (B)</p> Signup and view all the answers

What is the SI unit of momentum?

<p>kg m/s (D)</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 (A)</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 (D)</p> Signup and view all the answers

What is the formula for momentum?

<p>$mv$ (C)</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 (A)</p> Signup and view all the answers

What is the SI unit of force?

<p>Newton (C)</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 (C)</p> Signup and view all the answers

What is the product of mass and acceleration known as?

<p>Force (B)</p> Signup and view all the answers

When are forces said to be balanced forces?

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

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

<p>Friction (C)</p> Signup and view all the answers

Flashcards

Frictional force

A force that always opposes the motion of objects.

Newton

The SI unit of force.

Balanced forces

Forces that completely cancel each other out, resulting in a zero resultant force.

Force

A push or pull that can change the motion of an object.

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Acceleration

The effect of a force on an object, causing it to accelerate.

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Momentum

The product of an object's mass and its velocity.

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kg m/s

The SI unit of momentum.

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Inertia

The tendency of an object to resist changes in its motion.

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Law of Conservation of Momentum

In a closed system, the total momentum before and after a collision remains constant.

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Second Law of Motion

The relationship between the rate of change of momentum and the applied unbalanced force.

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Momentum Formula

The formula used to calculate momentum.

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Total Momentum in Closed Systems

The total momentum of a system remains constant if there are no external forces acting on it.

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Force Formula

The product of an object's mass and its acceleration.

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Balanced Forces

The state where forces are balanced and the object remains at rest or continues to move at a constant velocity.

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Friction

The force that always opposes the motion of objects.

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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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