# What are Newton’s 1st 2nd and 3rd laws of motion class 9?

In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

## What is force and laws of motion class 9?

An object remains in a state of rest or of uniform motion in a straight line unless compelled to change that state by an applied force. In other words, all objects resist a change in their state of motion.

## What are the 7 types of forces?

• Applied Force.
• Gravitational Force.
• Normal Force.
• Frictional Force.
• Air Resistance Force.
• Tension Force.
• Spring Force.

## What is Newton’s 2nd law called?

The other name for Newton’s second law is the law of force and acceleration.

## What is SI unit of force?

The SI unit of force is the newton, symbol N. The base units relevant to force are: The metre, unit of length — symbol m. The kilogram, unit of mass — symbol kg. The second, unit of time — symbol s.

## What is inertia SI unit?

Moment of inertia is defined as the tendency of an object to remain in a state of rest or of a constant rotational velocity. Greater the moment of inertia, more torque is required to change this state. Torque in rotational motion plays the same role as force in linear motion. Its SI unit is kg. metre2.

## What are the 2 main types of force?

Basically, there are two types of forces: Non-contact forces. Contact forces.

## What are the 3 main types of forces?

Types of Action at a distance forces are: Gravitational force, Electrical force and Magnetic forces.

## What are the 4 main types of forces?

fundamental force, also called fundamental interaction, in physics, any of the four basic forces—gravitational, electromagnetic, strong, and weak—that govern how objects or particles interact and how certain particles decay.

## What is Newton’s law formula?

Newton’s second law, which states that the force F acting on a body is equal to the mass m of the body multiplied by the acceleration a of its centre of mass, F = ma, is the basic equation of motion in classical mechanics.

## What are Newton’s 3 laws formula?

Mathematically, if a body A exerts a force →F on body B, then B simultaneously exerts a force −→F on A, or in vector equation form, →FAB=−→FBA. Newton’s third law represents a certain symmetry in nature: Forces always occur in pairs, and one body cannot exert a force on another without experiencing a force itself.

## What are the 3 equation of motion?

The three equations are, v = u + at. v² = u² + 2as. s = ut + ½at²

## What is meant by 1 newton?

It is defined as that force necessary to provide a mass of one kilogram with an acceleration of one metre per second per second. One newton is equal to a force of 100,000 dynes in the centimetre-gram-second (CGS) system, or a force of about 0.2248 pound in the foot-pound-second (English, or customary) system.

## What is Newton’s 3rd law also known as?

Newton’s third law states that when two bodies interact, they apply forces to one another that are equal in magnitude and opposite in direction. The third law is also known as the law of action and reaction.

## What is the formula of law of inertia?

Newton’s second law of motion describes this phenomenon and property with an inertia formula that states “Force = Mass * Acceleration”. The formula states that objects that have more mass require more force to change their acceleration.

## What is the symbol of force?

It is measured in the SI unit of newton (N). Force is represented by the symbol F (formerly P).

## What is unit of velocity?

The SI unit of velocity is metres per second (m/s). Alternatively, the velocity magnitude can also be expressed in centimetres per second (cm/s).

## Is force a vector?

A force has both magnitude and direction, therefore: Force is a vector quantity; its units are newtons, N. Forces can cause motion; alternatively forces can act to keep (an) object(s) at rest.

## What is the unit of momentum?

As mentioned above, the units of momentum will be the product of the units of mass and velocity. Mass is measured in kg and velocity in ms-1, therefore, the SI unit of momentum will be kgm/s(-1).

## What is the symbol of inertia?

The Moment of Inertia is often given the symbol I. It is the rotational analogue of mass. In Newtonian physics the acceleration of a body is inversely proportional to mass.

## What is the unit of impulse?

The SI unit of impulse is Newton-seconds (Ns) or kg m/s.

## Is weight a force?

Weight is a force that acts at all times on all objects near Earth. The Earth pulls on all objects with a force of gravity downward toward the center of the Earth.

## Is inertia a force?

Inertia is the force that holds the universe together. Literally. Without it, matter would lack the electric forces necessary to form its current arrangement. Inertia is counteracted by the heat and kinetic energy produced by moving particles.

## Is gravity a force?

The answer is gravity: an invisible force that pulls objects toward each other. Earth’s gravity is what keeps you on the ground and what makes things fall. Anything that has mass also has gravity. Objects with more mass have more gravity.

## Which force is strongest in nature?

The strong nuclear force, also called the strong nuclear interaction, is the strongest of the four fundamental forces of nature.