Friction class-4

This video from Kriti Educational Videos explains about the friction. Here it explains the effects, properties, advantages and disadvantages. This video is suitable for class 4.
The video is communicated in English
Contents:
1. Friction- introduction
2. Properties of Friction
3. Effects of Friction
4. Advantages
5. Disadvantages
6. Methods of reducing friction
Video uploaded under permission from Kriti Prakashan Pvt Ltd, copyright with www.kritiprakashan.com.
0:00 Introduction
0:18 Properties of friction
0:51 EFFECTS OF FRICTION
1:02 Friction produces heat
1:15 Friction causes wear and tear in a machine
1:44 DISADVANTAGES OF FRICTION
3:22 METHODS OF REDUCING FRICTION
3:45 By using lubricants (grease, oil)
4:01 By using ball bearings
4:13 By using wheels or rollers on heavy suitcase
4:28 By streamlining