describe a situation where more friction is desirable and a situation where less friction is desirable ??
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Depending on the application, friction may be desirable or undesirable. Certain applications, such as tire traction on pavement and braking, or when feet are firmly planted to move a heavy object, rely on the beneficial effects of friction for their effectiveness.
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Answer:
Friction is not desirable in moving parts of engines of vehicles. Even with radiator full of cold water the engine can overheat and slow down its travel. The driver is forced to stop and restthe vehicle.
It is also not desirable when sliding heavy objects up the inclined plane. More force is needed to raise the load to a desired height
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