CLASS :11 || DAY 01 || WORK , POER AND ENEGRY ||

Class 11 - Physics
Day 01: Work, Power, and Energy
Topics to Cover:
Introduction to Work, Power, and Energy
Work
Power
Energy
1. Introduction to Work, Power, and Energy
Objective: Understand the fundamental concepts of work, power, and energy in physics.
Key Points:
Work, power, and energy are essential in understanding how forces affect the motion and functioning of objects.
These concepts have practical applications in everyday life, from moving objects to powering machines.
2. Work
Definition of Work:
Work is done when a force causes an object to move in the direction of the force.
Mathematically,
W=F⋅d⋅cosθ
W=F⋅d⋅cosθ, where:
W = Work done
F = Force applied
d = Displacement of the object
θ = Angle between the force and displacement vectors
Units: Work is measured in Joules (J) in the SI system.
Types of Work:
Positive Work: When the force and displacement are in the same direction (e.g., pushing a car forward).
Negative Work: When the force and displacement are in opposite directions (e.g., friction acting opposite to motion).
Zero Work: When the force is perpendicular to displacement (e.g., carrying a bag without lifting it up or down).
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