Best Physics WORK & ENERGY Notes to ace in Exam One-Shot Summarised Chapter
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Physics
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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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