Learning Path
Question & Answer1
Understand Question2
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Explore TopicChoose the Best Answer
A
The static friction coefficient will decrease more than the kinetic friction coefficient.
B
The static friction coefficient will remain unchanged while the kinetic friction coefficient increases.
C
Both friction coefficients will increase equally due to temperature.
D
The kinetic friction coefficient will decrease more than the static friction coefficient.
Understanding the Answer
Let's break down why this is correct
Answer
When a tire brakes for a long time it heats up, making the rubber softer and able to press more firmly into the wet road surface. This increased deformation raises the static friction coefficient, because the tire can grip the road better before it starts to slide. The kinetic friction coefficient, which governs sliding once motion begins, does not benefit as much from the softness and may even stay the same or drop slightly as the rubber becomes too pliable. Consequently, the static coefficient will usually rise more than the kinetic coefficient as temperature climbs. For instance, a tire at 70 °C might have a static μ of about 0.
Detailed Explanation
Heat makes rubber softer and less sticky. Other options are incorrect because The belief that a hotter tire would keep static friction same while kinetic rises is mistaken; Assuming both friction levels go up ignores that rubber softens at heat.
Key Concepts
Static vs. Kinetic Friction Coefficient
Measurement Techniques for Friction Coefficient
Temperature Effects on Friction Coefficient
Topic
Friction Coefficient Variations
Difficulty
hard level question
Cognitive Level
understand
Practice Similar Questions
Test your understanding with related questions
1
Question 1When considering the friction between a rubber tire and a wet asphalt road, which material property is most likely to increase the friction coefficient compared to rubber on dry asphalt?
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Practice
2
Question 2If a car is moving on a road and the coefficient of static friction between the tires and the surface is 0.7, what does this value indicate about the car's ability to start moving?
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Practice
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