IMPORTANT NOTES FOR CLASS 9

         VILLAGE OF PALAMPUR Q1) Which village was connected to Palampur?  Ans)Raiganj was a big village connected to Palampur.  Q2) What are the other activities practised in Palampur? Ans) Small scale manufacturing, shop keeping and dairy farming, transport are the other activities practised in Palampur.  Q3)Which capital can be considered as the best: land,  labour ,physical or human capital and why?  Ans) Human capitalism considered as the best because it is the stock of productive knowledge and skills emboided in human being. The other capitals are useless without human capital because humans can only make productive use of the capitals.  Q4) How was multiple cropping practiced in Palampur?  Ans) More than one crop grown on a same piece of land during the year is called multiple cropping. People in Palampur are able to grow 3 different crops because they have electricity and we'll developed irrigation system. Many farmers grew potato as third crop in their field.  Q5) Is there

Let us consider an object moving with initial velocity (u), after time (t), it attains final velocity (v), covering distance (s) with uniform acceleration (a).   First equation of motion- VELOCITY-TIME RELATION (v=u+at) OA= u  BC= v  BD= v-u  OC= t                   Acceleration= Change in velocity ÷                                             Time taken          a= BC-DC / OC = BD/OC          a= v-u/t (cross multiplication)       u+at =v (arrange it according to equation) Hence, first equation v=u+at is proved.  Second equation of motion  POSITION-TIME RELATION (s=ut+½ at²)  S= Area under the graph S= Area of rect.(OADC)+Area of triangle ABD                S=OA×OC+½ AD×BD                 S= ut+½(t) (v-u)   Put the values of (v-u) from eq 1 [v=u+at]                                                             [v-u=at] s=ut+½(t)(at) (arrange according to eq) Hence, second equation s=ut+½at² is proved.  Third equation of motion  POSITION-VELOCITY RELATION (2as=v²-u²)     S= Area under the

FUNDAMENTAL UNITS OF LIFE. Cell- Basic structural and functional unit of life. It was first observed by Robert Hooke in 1665. Types of cell- Prokaryotic cell and Eukaryotic cell . COMPONENTS OF EUKARYOTIC CELL Nucleus-The organelle that contains the cell's DNA and it is the control center of the cell.  Ribosomes -The organelle in which amino acids are hooked together to make proteins.  Endoplasmic Reticulum- The organelle that makes lipids, breakdown drugs and other substances and packages proteins for Golgi complex.  Mitochondria - The organelle that breaks down food molecule to make ATP.  Chloroplast - The organelle that uses the energy of sunlight to make food.  Golgi Complex- The organelle that processes and transports proteins and other material out of cell.  Large central vacuole - The organelle that stores water and other materials.  Lysosome- The organelle that digests food particles, wastes,cell particles . COMPONENTS OF PROKARYOTIC CELL Cytoplasm- It is the semifluid subs

                 MOTION MOTION- A body is said to be in motion when it's position changes with respect to a reference point.  REST- A body is said to be in a state of rest when it's position does not change with respect to a reference point.  Types of motion -  Uniform motion -  When a body travels equal distance in equal interval of time then the motion is said to be in uniform motion.   Non-uniform motion- When a body travels unequal distance in equal interval of time then the motion is said to be in non-uniform motion.   Physical quantities - It is a physical properties of material that can be measured. 1)SCALAR QUANTITY- It is physical quantity having only magnitude not direction.  Example-Speed , Distance  2)VECTOR QUANTITY- it is a physical quantity having both magnitude as well as direction.  Example- Velocity, Acceleration, Displacement  DISTANCE- The actual path length travelled by an object is called Distance.  It is a scalar quantity.  It is always positive and can&#