NCERT - 8 - Science :: Friction

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[Contributor - Anu Nived]

Objective: To teach the students about about friction and types of friction

Subtopics to be covered:

Factors affecting friction
How to increase and decrease friction
Fluid friction

Learning Outcome:

Students can relate friction with their day to day life (how ball bearings work, rubbing hands with soil, etc.)
They know about the effects of friction

[Contributor - Kripa S]

http://epathshala.nic.in/wp-content/doc/book/flipbook/ClassVIIIFlipbook/0855-Vigyan/Chapter-12/index.html (NCERT Hindi Medium)

http://epathshala.nic.in/wp-content/doc/book/flipbook/ClassVIIIFlipbook/0854-Science/Chapter-12/index.html (NCERT English Medium)

https://drive.google.com/open?id=0BzNF2YyqQxJ-cGlYZXA4NzJUZDg (JEPC Board) (Hindi Medium)

[Contributor - Kripa S]

https://www.youtube.com/watch?v=kvbOmoNXQ44 (force, energy and friction)

https://www.youtube.com/watch?v=q5FEuw6mB8s (friction video 1)

https://www.youtube.com/watch?v=Tz96XD6kQSI (friction video 2)

[Contributor - Anu Nived]

http://study.com/cimages/multimages/16/rsz_matches-637771_640.png (friction)

https://s-media-cache-ak0.pinimg.com/736x/85/bb/2f/85bb2f70d04627b2b504ce0d4c410358.jpg (static friction)

http://www.hollywoodshoerepair.com/images/beforeAfter_fullSole02.jpg (reduce friction)

http://www.ekshiksha.org.in/images_friction_VIII/figure_17.JPG (fluid friction)

[Contributor - Kripa S]

1. Make an inclined plane on a smooth floor, or on a table. You may use a wooden board supported by bricks, or books. Put a mark with a pen at any point on the inclined plane. Now let a pencil cell move down from this point. How far does it move on the table before coming to rest? Note down the distance. Now spread a piece of cloth over the table. Make sure that there are no wrinkles in the cloth. Try the activity again.

2. http://www.arvindguptatoys.com/toys/books.html

[Contributor - Tejashri Khadilkar]

https://drive.google.com/open?id=1xcx9Af87DJmQhO0GyW6rWgMIYBGNqdVa (Answer Key 1)

https://drive.google.com/open?id=1rcPpeVTz6t5jO9fCJ0ILTWHYggQIIlyo (Answer Key 2)

[Contributor - Tejashri Khadilkar]

https://drive.google.com/open?id=1G6f1KJBJs6Nl4BZA8iYc_s5WGU81Agb0 (Worksheet 1)

https://drive.google.com/open?id=1HCfxBXcfq8hoUDCzVfVchklZd8BlwtJK (Worksheet 2)

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