Sound chapter Test class 8

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Notes- Force class 9th

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Force And Laws Of Motion   Force:-              It is pull   or push acting on an object which can change   shape, size of an object   is called   force.   Effects of force 1.       Force can change the shape of an object . 2.       Force can change the direction of an object. 3.       Force can change the size of an object. 4.       Force can change the   speed of an object.   Types of force ·         Balanced force ·         Unbalanced force     Balanced force   A force is said to be balanced if the resultant of all the forces acting on an object is zero . Unbalanced force A force is said to be unbalanced if Resultant of two forces acting on an object is not equal to zero.   Newton ‘s laws of motion ...
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Electricity Class 10 Notes Has The Answer To Everything about Electricity.

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Electricity Class 10 Notes Has The Answer To Everything about Electricity. Electric CIrcuit:- A closed path through which electric current flows is called electric circuit. Types of  wires: Neutral wires (black) earth wires (green wire ) Live wire ( Red wire)  Electricity supplied to our house is 220 v 50 Hz, in A.C.(i.e. Alternating Current) Some Important terms related to electric circuit  Charge Current  Resistance Voltage Define  Charge:-    It is defined as the particles (mainly negative charges) which are responsible for the flow o  electric current. Formula Q= I t Units-  I t has unit Coulomb (C).. Current:-   It is defined as the flows of electric charges (mainly electrons) in the wire per unit time. Formula -I=Q/T Unit It has unit Ampere (A). Define the unit of current (1 Ampere) A current is said to be 1 ampere when one-coulomb charge...
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Flotation chapter-wise notes class 9

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Flotation Flotation When an object is placed on the surface of a liquid if the object float on the surface this condition is called flotation. Buoyancy The property of the liquid which makes object float on its surface. this property is called by buoyancy. Density It is defined as mass per unit volume. Formula Unit:   It has unit kilogram per cubic meters ( Kg / m 3  ). Relative density (RD) It is defined as the ratio of the density of the liquid to the density of the water at 4 degrees Celsius. Formula Relative density= density of the liquid /density of the water at 4 degree Celsius Relative density is constant it has no unit .  At 4 degrees Celsius water has a maximum density that's why we take the water at 4 degrees Celsius. Pressure Pressure is defined as a force acting per unit area. Formula Unit newton per square meters ( N/m 2 ) or pascal( Pa) Define one Pascal Pressure is said to be one Pascal when a force of ...
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