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Work And Energy | CBSE Class 9 Science | Part 1 | Physics
Hello students, here in this video we are going to study a very important ad interesting topic as, Work and Energy from class 9 Science.
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Let’s start with the term Energy,
Introduction of Energy:
Work, energy, and power are the most used terms in Physics. They are probably the first thing you learn in your Physics class. Work and energy can be considered as two sides of the same coin.
Work done is generally referred in relation to the force applied while energy is used in reference to other factors such as heat. Power is defined as work done per unit time.
What is Work?
Work is said to be done when a force applied to an object moves that object.
Work is said to be done when a body or object moves with the application of external force. We can define work as an activity involving a movement and force in the direction of the force.
We can calculate work by multiplying the force by the movement of the object.
W = F × d
The SI unit of work is the joule (J)
What is Energy?
We can define energy as the capacity to do work.
Energy is the ability to perform work. Energy can neither be created nor destroyed. It can only be transformed from one kind to another.
The SI unit of energy is joules (J), which is named in honor of James Prescott Joule.
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