Friction
A 5 kg block rests (μ_s = 0.4). Minimum horizontal force to start motion? (g=10 m/s²)
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About This Question
- Subject
- physics
- Chapter
- laws of motion
- Topic
- friction
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
20 N
An object starts moving when the applied external force F exceeds the maximum value of static friction (limiting friction fmax).
- Normal Force (N): For a block on a horizontal surface, N=mg. N=5 kg×10 m/s2=50 N.
- Limiting Friction (fmax): fmax=μsN=0.4×50 N=20 N. To start motion, the applied force must be at least equal to 20 N. If F<20 N, static friction will exactly cancel the applied force, and the block remains at rest.
This medium 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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