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Why is it hard to move a heavy bookcase across a carpeted floor? And why is it easier to keep it moving than it was to get it started moving? You might think it's all about weight, but actually it's about friction. Two kinds of friction! In today's episode of Crash Course Physics, Shini Somara tells us about Static and Kinetic friction; how they work and how they're different.


SPoken class about connnection of paranormality and psychology.

In this lesson we will learn Management in company and grammar - countable/uncountable words

In this class we will discuss different celebration and parties and revise passive voice

In this class we will revise the airport lexics and learn new words.

In this class we will discuss different interesting rules in other countries. Also we will learn grammar - modal verbs Must and Have, practice they usage.

In this class we will discuss hobbies and likes

In this class we will revise alphabet, learn numbers and To be, days of week