## Work and Energy Class 9 Questions and Answers NCERT Solutions FREE PDF Download

NCERT Solutions for Class 9 Science Chapter 10 - Work and Energy

## FAQs on NCERT Solutions for Class 9 Science Chapter 10 - Work and Energy

**1. How Many Exercises Does this Chapter Include?**

Work and energy is a vast chapter that includes about 5 exercises in total. These are mentioned below.

**Exercise 11.1 -**1 Question on work and power.**Exercise 11.2 -**4 questions on energy and units of energy.**Exercise 11.3 -**3 questions on different forms of energy.**Exercise 11.4 -**4 questions on kinetic energy and its expression.**Exercise 11.5 -**21 questions on potential energy and its expression and conservation of energy.

2. How is work related to energy in physics?

Work and energy are closely related concepts in physics. Work is done when a force acts on an object to move it over a distance. The work done on an object results in a change in its energy. According to the work-energy theorem, the work done by the net force on an object is equal to the change in its kinetic energy. Mathematically, this is expressed as $(W = \Delta KE)$ . This means that when work is done on an object, it can increase or decrease its energy, demonstrating the transfer and transformation of energy through work.

3. What is the kinetic energy of an object in class 9 science chapter 10?

The Kinetic Energy of a particular object is the energy that it has because of its motion. It is known as the work required to accelerate the respective body of a given mass from rest to its actual velocity. Thus, any object in motion always has kinetic energy. For instance, a person walking or running, a thrown baseball, a crumb falling from a tabletop are all examples of Kinetic Energy. To know more about it, visit Vedantu website or Vedantu Mobile app. The solutions provided by Vedantu are free of cost.

4. What is work according to Class 9 Science Chapter 10 Question Answer NCERT?

Work done is as the product of two components- force (F) acting in the direction of the displacement and the magnitude of displacement (s) of the object. Thus, the two conditions required for work to be done are the action of force on an object and the displacement of the object. The formula for work done is Work Done = Force x Displacement, W = Fs. It is a scalar quantity (because it has only magnitude and no direction) and it is measured in Joules (J). class 9 science chapter 10 question answer is a important chapter from exams point of you to Score well.

5. What is energy according to Work and Energy Class 9 NCERT Solutions?

A body's Energy is defined, in Physics, as the capacity of that body to perform work. Energy has only magnitude and no direction i.e., it is a scalar quantity and is measured in Joules (J). The Sun constitutes the largest natural source of energy for all living creatures. Some other energy sources are nuclei of atoms, tides, and the interior of the Earth. There are several types of energy, such as Potential Energy, Kinetic Energy, Mechanical Energy, Light Energy, Chemical Energy, Electrical Energy, and Heat Energy.

**6. What is the formula of Energy according to Chapter 11 of NCERT Solutions for Class 9 Science?**

A body's Energy, in Physics, is defined as the capacity of that body to perform work. Energy’s SI unit is Joules. It is scalar in nature as it has only magnitude and no direction. The formula for Potential Energy, Ep, of an object is equivalent to the work done over an object of mass 'm' to raise it by a height 'h' when 'g' is the acceleration due to gravity. Therefore, Ep = mgh. Work and energy class 9 exercise answers provided by Vedantu will help you to crack the exams.

**7. What is Work and Energy in Physics of Class 9?**

In physics, work is defined as the sum of two factors: the force acting in the direction of displacement (F) and the amount of the object's displacement (s). The capacity of a body to produce work is defined as its energy in physics. Both Work and Energy are scalar quantities that are measured in Joules (J). Class 9 work and energy question answer gives you better practice to get expertise in the chapter.

8. What is the difference between kinetic energy and potential energy?

Kinetic energy is the energy an object possesses due to its motion. It depends on the mass of the object and the square of its velocity, given by the formula $(KE = \frac{1}{2}mv^2)$ . On the other hand, potential energy is stored in an object because of its position or configuration. A common type is gravitational potential energy, which depends on the object's mass, the height above the ground, and the acceleration due to gravity, calculated as $(PE = mgh)$ . While kinetic energy is associated with motion, potential energy is associated with the position or state of an object. Students can also refer to class 9 work and energy question answers provided by NCERT Solution for better understanding.