After studying this unit, the students will be able to:
state kinetic molecular model of matter (solid, liquid and gas forms).
describe briefly the fourth state of matter i.e. Plasma.
define the term density.
compare the densities of a few solids, liquids and gases.
define the term pressure (as a force acting normally on unit area).
explain how pressure varies with force and area in the context of everyday examples.
explain that the atmosphere exerts a pressure.
describe how the height of a liquid column may be used to measure the atmospheric pressure.
describe that atmospheric pressure decreases with the increase in height above the Earth's surface.
explain that changes in atmospheric pressure in a region may indicate a change in the weather.
state Pascal's law.
apply and demonstrate the use with examples of Pascal's law.
state relation for pressure beneath a liquid surface to depth and to density i.e., (P=pgh) and solve problems using this equation.
state Archimedes principle.
determine the density of an object using Archimedes principle.
state the upthrust exerted by a liquid on a body.
state principle of floatation.
explain that a force may produce a change in size and shape of a body.
define the terms stress, strain and Young's modulus.
state Hooke's law and explain elastic limit.
9th Physics Notes
9th Physics Chapter 7
Class IX Helping Notes
Matric Part-1 Notes
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