1. Explain why objects moving in fluids must have special shapes ?
2. Explain why sliding friction is less than the static friction ?
Answers
Answer:
1. Moving objects in fluid must have special shapes because the drag force or the friction force depends of the shape of the object. Special shapes are designed to minimise the opposing frictional force.
2. Friction comes into play when irregularities present in the surfaces of two objects in contact get interlocked with each other. In sliding, the time given for interlocking is very small. Hence, interlocking is not strong. Therefore, less force is required to overcome this interlocking. Because of this reason sliding friction is less than the static friction.
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Answer:
1. Moving objects in fluid must have special shapes because the drag force or the friction force depends of the shape of the object. Special shapes are designed to minimise the opposing frictional force.
2. Friction comes into play when irregularities present in the surfaces of two objects in contact get interlocked with each other. In sliding, the time given for interlocking is very small. Hence, interlocking is not strong. Therefore, less force is required to overcome this interlocking. Because of this reason sliding friction is less than the static friction.