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Theory

Exercises

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

Tests

1. Training test

Difficulty: easy

6

Teacher manual