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Question
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
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Solution
Knot in a thread : increase friction : : Ball bearing : reduces friction
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RELATED QUESTIONS
Friction depends on the ______ of surfaces.
Give an example to illustrate the existence of the force of friction.
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The force of friction acting between two bodies in contact while at rest is known as ................ friction.
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Rolling friction is slightly greater than sliding friction.
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
Assertion: We can live very happily if friction is not present in nature.
Reason: The airplane shape is streamlined to reduce the effort of frictional force.
Assertion: There is a danger of a vehicle skidding on a wet road.
Reason: The tires of the vehicle lose their grip on the road due to an increase in friction due to the presence of water on the road.
