Kinetic energy is the energy posses by the object when it is in motion. The formula for Kinetic energy: K.E = Momentum: It is the product of the mass and velocity of a body or particle.

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## What is physics 9th class?

Physics is the study of energy and matter in space and time. It deals with how the fundamental constituents of the universe interact. Content for Class 9 Physics covers the concepts of Motion, Force and Laws of Motion, Gravitation, Work and Energy and Sound.

## What is motion class 9?

Motion is a change in position of an object over time. Motion is described in terms of displacement, distance, velocity, acceleration, time and speed.

## How many chapters are there in physics class 9?

The NCERT Solutions for Class 9 Physics cover all the 5 chapters of the prescribed Physics syllabus and are the best alternative.

## What is law inertia?

1. Newton’s First Law of Motion (Inertia) An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

## What is K in physics class 9?

The letter k is generally used to denote a constant value. Some of the most commonly used constants denoted by k are: Boltzmann constant, which has a value of 1 . 38 × 10 – 23 m 2 kg · s – 2 K – 1 .

## What is potential energy Mcq?

Potential Energy MCQ Question 6 Detailed Solution Potential energy: The energy of any object due to its position with respect to a reference point is called potential energy. It is denoted by PE.

## What is the formula energy Mcq?

The dimensional formula for kinetic energy is kg*(m/s)2, which may be defined as 1 joule. 1 joule = kg*m2/s2. 1 Joule is defined as the energy transferred to an object when the force of 1 Newton is acted on a body through a distance of 1 meter.

## What are the 7 types of motion?

- Oscillatory Motion.
- Rotational Motion.
- Translational Motion.
- Periodic Motion.
- Circular Motion.
- Linear Motion.
- Uniform Motion.
- Non-Uniform Motion.

## What is the 4 types of motion?

- linear.
- rotary.
- reciprocating.
- oscillating.

## What are the 3 types of motion?

According to the nature of the movement, motion is classified into three types as follows: Linear Motion. Rotary Motion. Oscillatory Motion.

## Why do we fall ill?

Answer: This is because the immune system of our body is normally fighting off microbes. Our body have cells that are specialised in killing infecting microbes. Whenever any microbes or foreign body enters our system, these cells become active and kill the microbes that could cause any damage to the body.

## How can I study science in Class 9?

Focus on application-based questions from the ‘Matter in our Surroundings’ chapter. Solve as many numericals on ‘Mole Concept’ and study the valencies of elements. Practise writing chemical formulae. Remember the theories on various models of the atom.

## What is the 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 Newton’s 2nd law called?

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

## What is energy formula?

Isaac Newton, in full Sir Isaac Newton, (born December 25, 1642 [January 4, 1643, New Style], Woolsthorpe, Lincolnshire, England—died March 20 [March 31], 1727, London), English physicist and mathematician, who was the culminating figure of the Scientific Revolution of the 17th century.

## What is the value of G?

The acceleration due to gravity on Earth or the value of g on Earth is 9.8 m/s2. This implies that, on Earth, the velocity of an object under free fall will increase by 9.8 every second. This acceleration is due to the Earth’s gravity.

## What is Ke formula?

Energy is defined as the capacity to do work. Formula. The energy stored in an object due to its position and height is known as potential energy and is given by the formula: P.E. = mgh.

## What is the unit of specific kinetic energy?

Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

## What is potential energy in FEM?

Specific kinetic energy is kinetic energy of an object per unit of mass. is velocity. It has units of J/kg, which is equivalent to m2/s2.

## How do you find specific kinetic energy?

POTENTIAL ENERGY, ∏. The total potential energy of an elastic body , is defined as the sum of total strain energy (U) and the work potential (WP) . ∏ = U + WP. Page 2. For linear elastic materials , the.

## What is energy conservation Mcq?

To calculate kinetic energy: Find the square of the velocity of the object. Multiply this square by the mass of the object. The product is the kinetic energy of the object.

## What is the definition of power Mcq?

Conservation of energy: The Law of conservation of energy states that the total energy of an isolated system remains conserved (constant), that is, it can neither be created nor be destroyed but it can be transformed from one form to another.

## When Ke decreases the work done is?

power is energy per unit of time. power is energy. power is current per unit of time.

## What causes wind class 9?

According to work energy theorem the work done by the force is equal to increase in the kinetic energy of the body. If the kinetic energy of the body increases then work is positive and if the kinetic energy decreases work is negative. Work done by conservative forces to move a particle in closed path is zero.