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प्रश्न
Answer in one sentence.
Define friction.
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उत्तर
The property which resists the relative motion between two surfaces in contact is called friction.
संबंधित प्रश्न
Answer in one sentence.
Why force of static friction is known as ‘self-adjusting force’?
State any four methods to reduce friction.
Answer in short.
What is rolling friction? How does it arise?
Answer in short.
Explain how lubricants help in reducing friction.
Answer in short.
State the laws of static friction.
Answer in short.
State advantages of friction.
State disadvantages of friction.
Long answer type question.
Define coefficient of static friction and coefficient of kinetic friction. Give the necessary formula for each.
Calculate the coefficient of static friction for an object of mass 50 kg placed on horizontal table pulled by attaching a spring balance. The force is increased gradually it is observed that the object just moves when spring balance shows 50 N.
A body of mass 37 kg rests on a rough horizontal surface. The minimum horizontal force required to just start the motion is 68.5 N. In order to keep the body moving with constant velocity, a force of 43 N is needed. What is the value of coefficient of static friction?
When the surface of one body slides over another, in which direction does friction act?
Which of the following best defines friction?
Why does a rolling ball on a playground eventually come to a halt?
Which of the following is a disadvantage of friction in mechanical systems?
Why is it difficult to walk on polished floors with soapy water?
