Measurements

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1.general physics  1.1 length and time  -i-Physical Quantity Physical Quantities A physical quantity is a property of an object that can be measured with a measuring instrument. A physical quantity is usually expressed as “a magnitude ( numerical value)  and a  physical unit or more ” Example :- Normal body temperature of a healthy human being is  37  0 C -ii-Length Measuring Length. Length is “the distance between two points in a space”. According to SI units, the length quantity is expressed in meter. There are several kinds of measuring devices used to measure quantity of length, among others, are as follows. Tools used… a-   Measuring tape. b-   Ruler c-   Vernier callipers. d-    Micrometer Measurement of length Length is measured accurately through many methods. Here are some: Method Notes Ruler Used to make simple measurements accurate to  0.1 cm  (1 mm) Vernier caliper Used to make simple measurements accurate to
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Motion

Speed

Speed can be defined as the distance covered by a moving object in unit time taken. Speed is a scalar quantity and hence it can only be represented by magnitude not by direction.In other words, “The speed of an object can also be considered as the magnitude of the velocity of the object”. 

Speed Formula :

Speed =  X =  where, 
X = speed of the moving object; 

d = distance traveled by the moving object; 

t = time taken to travel distance ‘d’. 



Formulas for finding area, gradient and acceleration are mentioned in image below.


  • acceleration and deceleration are related to changing speed 

















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