Class 9 Force and Laws of Motion Quiz and Flashcards

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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?

Both magnitude and direction Signup and view all the answers

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

Produces acceleration Signup and view all the answers

What is the product of mass and velocity known as?

Momentum Signup and view all the answers

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

Force Signup and view all the answers

What is the SI unit of momentum?

kg m/s 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?

Inertia 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?

It remains constant Signup and view all the answers

What is the SI unit of momentum?

kg m/s 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?

Directly proportional 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?

Inertia Signup and view all the answers

What is the formula for momentum?

$mv$ 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?

Remains constant Signup and view all the answers

What is the SI unit of force?

Newton 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?

Inertia Signup and view all the answers

What is the product of mass and acceleration known as?

Force Signup and view all the answers

When are forces said to be balanced forces?

When their resultant force is zero Signup and view all the answers

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

Friction 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.