What is WORK and ENERGY in a Surprise Test Now? Part 4

Discover the fundamentals of work and energy as we dive into a surprise test on these essential physics concepts. Understand the relationship between work, energy, and their various forms, and learn how to apply these principles to solve problems. Whether you're a student looking to grasp the basics or someone seeking to refresh their knowledge, this video is designed to provide a comprehensive overview of work and energy, covering key topics such as kinetic energy, potential energy, and the law of conservation of energy. Get ready to learn and test your understanding of these critical physics principles in a fun and engaging way.
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In our daily life, we often use words like work and energy. We say, “I worked very hard today” or “I don’t have energy.” But in Physics, these words have specific scientific meanings. Many students lose marks because they write daily-life meanings instead of scientific definitions.

The chapter Work and Energy is one of the most important chapters in Physics because it builds the foundation for understanding motion, power, machines, electricity, and mechanics. Almost every exam—unit test, surprise test, annual exam—includes questions from this chapter.

1. WHAT IS WORK?
Scientific Definition of Work

In Physics, work is said to be done when:

A force acts on an object, and

The object moves (displacement occurs) in the direction of the force.

If any one of these conditions is missing, then no work is done, even if force is applied.

Mathematical Expression of Work
Work

(W)

=

Force

(F)

×

Displacement

(s)
Work (W) = Force (F) × Displacement (s)

Where:

W = Work done

F = Applied force

s = Displacement in the direction of force

SI Unit of Work

The SI unit of work is Joule (J).

1 Joule is defined as:

The work done when a force of 1 Newton moves an object through a distance of 1 metre in the direction of the force.

Examples of Work Done

✔ Pushing a table and it moves
✔ Lifting a bucket of water
✔ Pulling a trolley
✔ Kicking a football

In all these cases:

Force is applied

Displacement occurs in the direction of force
Work
Force
Displacement
Direction of Force
Joule (J)
Newton (N)
Energy
Capacity to do Work
Kinetic Energy
Potential Energy
Gravitational Potential Energy
Velocity
Mass
Height
Acceleration due to Gravity (g)
Law of Conservation of Energy
Energy Transformation
Mechanical Energy
Motion
Rest
Commercial Unit of Energy
Kilowatt-hour (kWh)
Electric Energy
Power
Work Done
Zero Work
Positive Work
Negative Work
Falling Object
Stored Energy
Moving Object
Exam-Oriented Physics
Numericals
Surprise Test Preparation
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