Frictional+Force

BIG QUESTIONS for you to think about:

What are frictional forces? Ans By Celestine: Friction is a force that acts at a distance. It is a force that opposes motion. How does frictional force work? Ans By Celestine: Friction is produced when two or more surfaces rub against one another. What are the effects of frictional forces? Ans By Celestine: Friction produces heat, friction causes wear and tear, friction wastes energy.Ans By Wei Bin:Friction also can also help humans in some way such as driving on a road and friction prevents the car from skidding and it also applies for a bicycle too.

Watch the following video clips on Friction. The clip consists of important concepts on Friction. Make notes on your own Science notebook. After each video clip, go on to the activity listed.

In this clip, you will learn about what friction is and its effects. media type="youtube" key="DE5avLYh5Gs" height="344" width="425"

Activity 1 Imagine a world without friction (no resistance when surfaces touch each other) How will it be like? What problems will we be faced with? So how is friction important to us? How does it help us?

What about the world with excess friction? What hindrances will friction pose to us then?

In the table below, write to respond to the above-mentioned questions.


 * The world without friction.... ||
 * Everybody will be slipping on the ground and have injuries all around the body. ||


 * How does friction help us in our daily lives? ||
 * It prevents us from falling down, it stops a car when braking,sharpens a knife, make fire etc. ||


 * The world with excess friction.... ||
 * We will waste a lot of energy and may cause machines to overheat.And we need to exert a greater force on an object to push it up a slope. ||


 * How will excess friction be a hindrance to us? ||
 * It will cause materials which we use in daily lives to wear and tear .And by that, we need to spend our money and purchase a new material. ||

In this video clip, you will be shown examples of the uses of friction and its importance.

media type="youtube" key="f2sLP1OmIQ8" height="344" width="425"

Activity 2: 1. Did you imagine the world without friction the same way as shown in the second video clip? 2. Can you explain how ball bearings work? Write in your Science notebook. 

Extension activity Please go to the discussion page to post any message pertaining to your observations/ explanations on what you have learnt or want to share with the class. //**(Please do not search or post any video clips until further instructions.)

 Enjoy the song on Friction media type="youtube" key="TkXAJHitPAY" height="344" width="425"**//