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Chapter 10: Online NCERT Summary Class - VI (Science) for UPSC CSE
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This lesson deals with the concepts entirely related to the Motions and measurement of distances. As he begins his explanation, he throws light on some significant inventions like Steam Engine, Railways, Aeroplane etc. Then he takes up some basic concepts pertaining to distance vs displacement, where one will come across a chart of SI units along with physical quantity. Then he explains certain Si prefixes like yotta, zetta, exa, peta and much more. Lastly, he summarises rectilinear motion, rotational motion, periodic motion and rolling motion.

Roman Saini is teaching live on Unacademy Plus

Roman Saini
Part of a great founding team at Unacademy with Gaurav, Hemesh. Movies, Guitar, Books, Teaching.

Unacademy user
Probably the best teacher on Unacademy
Sir, which is the best source or video for "mathematics optional" ?
metric system is not SI unit of measurement. International unit of system is SI unit.
thank you... very helpful... Had one doubt.. isn't the definition given for reflection wrong? here, it defines refraction
great work sir... your efforts can be seen with every slides and every minutes of talk.... earlier the vedio were fast in initial chapter till 3 but it has been taken care off and now the speed is slow and we are able to remember lot many things in first watch only... the other point is voice is clear but a bit of echo heard...this might be due to room which might be vacant and a seperate arrangement for mike and speech must have been made... if some regular things likes books, table, cloth, articles are kept the echos will will absorbed...nevertheless the present course is awesome..could be heard clearly.... and the game changer is sir i am hardly reading any books and completely relying on unacademy from basics to core and mcq to mains... and has saved my lot of time... and i can revise it many times... and things dont get bored as also because you also have a very sweet voice... thanks is very less to say... but i deeply from my bottom of my heart pray for more success way ahead beacause you are adding milestones to our life... now i fell yes i can clear the exam and is not an difficult part...
very helpful course...and thnk u sooooo much sir....i just feel lucky to born in roman era... :) :)
  1. Class 6 Science NCERT Part 5: Chapter 10 Presented by Dr. Roman Saini

  2. About me MBBS, AIIMS Cleared CSE-2013 oves playing Guitar; Movie Buff Course Fee: Contribute s. Follow me on Unacademy me on Unacademy https /luna

  3. Chapter 10: Motions and measurement of distances Boats: simple log of wood with cavity, modified to resemble shape of aquatic animals (streamline) Till early 19th century, animal power (burden beast). Steam engine invented in 18th C by Newcommen, improved upon by Watts, but it got popular only in 19th century e, 19th century = Railways became commonplace (India is one of the first country in the world) 1910s Aeroplane - commercial and army 20th century: Electric trains, monorail, supersonic aeroplanes, spacecraft, satellite

  4. * Distance vs displacement Measurements of length is extremely important and need of gold standard is essential Unit : Fixed basic unit of measurement (Standard unit of measurement) Result of measurement : Unit + number 1790: French a standard called metric system (SI units)

  5. SI base unit Physical Quantity metre length kilogram mass second time electric current ampere kelvin candela mole temperature luminous intensity the amount of substance

  6. Metric prefix or SI prefix Storage device Capacity * yotta, zetta, exa, peta, tera Floppy KBs giga, mega, kilo, hecto, deca deci, centi, micro, mili, nano , pico, femto, atto, zepto, yocto CDs/ Pen Drives Mrs DVDs / Pen Drives GBs Hard disks TBs Servers PBs

  7. Straight line/ Rectilinear motion: Between 2 points * Circular/Rotational motion: distance from a fixed point remains the same. rcular/Kotational motion: aistance from a fixed point remains the same Ex: Fan Periodic motion: Pendulum. Repeats itself after sometime Rolling motion: Rectilinear + Rotational. Ex: ball