Friction
A block of mass 5 kg is placed on a rough horizontal surface. The coefficient of static friction is 0.4. What is the maximum static friction force? (g = 10 m/s²)
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About This Question
- Subject
- physics
- Chapter
- laws of motion
- Topic
- friction
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
20 N
- Limiting Friction Definition: The maximum force of static friction that can be exerted between two surfaces is fL=μsN.
- Normal Force (N): For a horizontal surface, N is equal and opposite to weight.
- N=mg=5×10=50 N.
- Subsitution:
- fL=0.4×50.
- Result: fL=20 N.
- Note: Static friction is self-adjusting. If you push with 10 N, friction is 10 N. Only when you exceed 20 N will the block move.
This easy difficulty physics question is from the chapter laws of motion, covering the topic of friction. It appeared in the 2025 exam.
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