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Factors fo friction and its types

1.	Introduction
2.	Factors affecting friction
3.	Cause of friction
4.	Positive aspects of friction
5.	Negative aspects of friction
6.	Increasing and reducing friction
7.	Rolling friction
8.	Fluid friction

1.	Smooth and rough surface Difficulty: easy	2
2.	Rolling friction Difficulty: easy	2
3.	Nature and properties of friction Difficulty: easy	3
4.	Types of surfaces Difficulty: medium	2
5.	Basics of friction Difficulty: medium	3
6.	Causes and effects of friction Difficulty: medium	3
7.	Increasing and reducing friction Difficulty: medium	4
8.	Analogies in friction Difficulty: medium	4
9.	Complete the sentences about friction Difficulty: medium	4.5
10.	Types of friction Difficulty: medium	4

1.

Training test

Difficulty: easy

6

1.

Methodical recommendation

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