Advertisements
Advertisements
प्रश्न
Long answer type question.
Define coefficient of static friction and coefficient of kinetic friction. Give the necessary formula for each.
Advertisements
उत्तर
- The coefficient of static friction is defined as the ratio of limiting force of friction to the normal reaction.
Formula: `mu_"S" = "F"_"L"/"N"` - The coefficient of kinetic friction is defined as the ratio of force of kinetic friction to the normal reaction between the two surfaces in contact.
Formula: `mu_"k" = "F"_"k"/"N"`
APPEARS IN
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 the laws of kinetic friction.
Answer in short.
State advantages of friction.
State disadvantages of friction.
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.
Answer the following.
A block of mass 37 kg rests on a rough horizontal plane having coefficient of static friction 0.3. Find out the least force required to just move the block horizontally.
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?
