A book is lying on the horizontal table top. If we tilt the table a little, then the book starts sliding down slowly. This happens because:
A. sliding friction is greater than static friction
B. sliding friction is less than force of gravity
C. static friction is greater than sliding friction
D. force of gravity is less than sliding friction
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Answers
Answer:
A. During sliding, contact points do not get enough time to get interlocked properly. Therefore, less friction. But, when the object is at rest, the surfaces interlock well, therefore friction is more. This explains why sliding friction is less than static friction.
B. Static friction is little more than sliding friction for any given pair of surfaces. Once the motion starts, the friction becomes slightly less than the maximum static friction called the limiting friction.
Once this motion stars, the irregularities act just as an obstruction against their relative motion, they are not interlocked now.
Therefore, it is easier to move the object when it is already in motion than to start it from rest.
C. Static Friction is more than sliding friction because, in case of STATIC FRICTION, the body needs to overcome the inertia of rest. And also in case of SLIDING FRICTION, the body posses inertia of motion since the body is already in motion.
D.Static friction is little more than sliding friction for any given pair of surfaces. Once the motion starts, the friction becomes slightly less than the maximum static friction called the limiting friction.
Once this motion stars, the irregularities act just as an obstruction against their relative motion, they are not interlocked now.
Therefore, it is easier to move the object when it is already in motion than to start it from rest.
Answer:
A. During sliding, contact points do not get enough time to get interlocked properly. Therefore, less friction. But, w hen the object is at rest, the surfaces interlock well, therefore friction is more. This explains why sliding friction is less than static friction.
B. Static friction is little more than sliding friction for any given pair of surfaces. Once the motion starts, the friction becomes slightly less than the maximum static friction called the limiting friction.
Once this motion stars, the irregularities act just as an obstruction against their relative motion, they are not interlocked now.
Therefore, it is easier to move the object when it is already in motion than to start it from the start.
C. Static Friction is more than sliding friction because, in case of STATIC FRICTION, the body needs to overcome the inertia of rest. And also in case of SLIDING FRICTION, the body posses inertia of motion since the body is already in motion.
D.Static friction is little more than sliding friction for any given pair of surfaces. Once the motion starts, the friction becomes slightly less than the maximum static friction called the limiting friction.
Once this motion stars, the irregularities act just as an obstruction against their relative motion, they are not interlocked now.
Therefore, it is easier to move the object when it is already in motion than to start it from rest.
Explanation:
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