What is the peak frictional resistance encountered just as a body starts to slide over another surface called________________?
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Answer: A. limiting friction
Explanation
Limiting friction is the maximum peak frictional resistance encountered just before sliding starts. Static friction increases with applied load until it reaches this critical threshold value. Once motion begins, sliding friction takes over and is typically lower than limiting friction. Friction opposes the relative motion between contacting solid surfaces under load. The coefficient of static friction determines the magnitude of this peak limiting friction force. Surface roughness and normal force dictate the exact value of limiting frictional resistance.
Machine designers account for limiting friction when calculating starting torque for electric motors. Braking systems rely on understanding frictional resistance limits to stop vehicles safely. Conveyor belt design requires overcoming static friction before loads can be transported. Sliding friction acts after the body is already in motion and is generally lower. Rolling friction occurs when wheels or rollers move across supporting surfaces. Kinematic and dynamic friction terms describe ongoing motion resistance rather than peak start limits.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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