Class 9 WORK AND ENERGY NOTES BY GUNNTAS SINGH

Navodaya Vidyalaya Samiti
E- Content Preparation
Class IX - SCIENCE
Work & Energy
Prepar
Anshu
PGT Ph
JNV In
Bhopal R

, Learning outcomes
■Students will be able to explain the scientific concept of work, and
the
■concept of positive, negative and zero work
■They will be able to explain the relationship of force with work.
■. They will be able to calculate the work done by any object in the a
or presence of force.
■They will be able to explain and understand the basics of Energy, f
energy, interconversion of energy and it’s relation with work.
■They will be able to describe kinetic energy and potential energy b
defining, deriving their formulae, their interconversion, examples a
related numerical.
■They will be able to elaborate law of conservation of energy with th
of examples to show that total energy is constant.
■They will be able to explain concept of power and all related units.
■They will be able to calculate electricity bill by concept of commerc
of energy and hence in the long run learn to check misuse of energ
their surroundings.

, Topics
■ Work
■ Zero, positive and negative work
■ Energy
■ Forms of energy
■ Kinetic energy
■ Gravitational potential energy
■ Elastic potential energy
■ Work energy transformation
■ Transformation of energy
■ Law of conservation of energy
■ Power
■ Commercial unit of energy

, WORK IS DIFFERENT FROM WORKING HA

■ Work in terms of Physics needs two conditions to be satisfie
■ A force should act on an object & The object must be displac
■ Work is defined as the product of the force and displacemen
the direction of force.
■ Work = Force× displacement
W= F×S