Force Analysis
Hardphysics
A block of mass 3 kg is pushed against a vertical wall by a horizontal force of 50 N. If the coefficient of static friction is 0.6, what is the static friction force acting on the block? (Use g = 10 m/s²)
Select the correct option:
Solution
Incorrect! Answer:
30 N
- Normal Force: The wall pushes back horizontally with N=50 N.
- Downward Force: Object's weight W=mg=3×10=30 N.
- Available Friction: fmax=μsN=0.6×50=30 N.
- Comparison: The downward active force (30 N) is equal to or less than the maximum possible friction (30 N).
- Result: Since it is the static case, friction matches the weight to maintain equilibrium. Force acting is 30 N.
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About This Question
- Subject
- physics
- Chapter
- laws of motion
- Topic
- force analysis
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
30 N
- Normal Force: The wall pushes back horizontally with N=50 N.
- Downward Force: Object's weight W=mg=3×10=30 N.
- Available Friction: fmax=μsN=0.6×50=30 N.
- Comparison: The downward active force (30 N) is equal to or less than the maximum possible friction (30 N).
- Result: Since it is the static case, friction matches the weight to maintain equilibrium. Force acting is 30 N.
This hard difficulty physics question is from the chapter laws of motion, covering the topic of force analysis. It appeared in the 2025 exam.
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