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Best Physics WORK & ENERGY Notes to ace in Exam One-Shot Summarised Chapter
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ey there, future physicist! Are you ready to conquer the world of physics? Whether you're struggling with concepts or just want to boost your grades, these notes are designed just for you! What’s Inside? Clear explanations of complex topics Diagrams and illustrations to visualize conc...

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  • October 5, 2024
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Class 9th

PHYSICS
WORK AND ENERGY
Work
• Work is said to be done when force is applied on an object and it gets displaced due to the application of force.
• It is a scalar quantity.
• Mathematically, work done is a product of force and displacement.
• Work = Force × Displacement
• S.I Unit of Work = Joules (J)
•1J=1N×1m


Types of Work Done
1. Positive Work done - Work done is said to be positive if force and displacement are in the same direction.
2. Negative Work done - Work done is said to be negative if force and displacement are in opposite directions.
3. Zero Work done - Work done is said to be zero if force and displacement are perpendicular to each other.


Energy
• The ability or capacity of an object to do work is called energy.
• It is a scalar Quantity.
• S.I Unit of energy - Joules
• The object which does work loses energy and the object on which work is done gains energy.


Kinetic Energy
• The energy possessed by an object due to its motion is called kinetic energy.
• K.E = ½ mv2




• Work done = Change in Kinetic Energy
= K.Ef – K.Ei
= ½ mv2 – ½ mu2


Potential Energy
• The energy possessed by an object due to its position or configuration is called potential energy.


Gravitational Potential Energy
• The gravitational potential energy of an object at a point above the ground is defined as the work done in raising it
from the ground to that point against gravity.

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