Question

what is fiction and what are the laws of friction .

Answer 1

• A fraction is a set of numbers in p/q form where p and q are integers and q is not equal to zero.

• The integer p is called numerator and q is called denominator.

• Numerator can be equal to denominator but not larger than denominator. This type of fraction is called proper fraction.

• When the numerator is bigger than denominator, it is called an improper fraction.

• Examples of fraction :— 1/2 , 2/7 , 4/3 , etc.

• There is an another form of fraction called mixed fraction. It is usually made by converting improper fraction. It has one whole number and a proper fraction with it.

• Example — 1 + (1/2). When writing this we don't write the '+’ sign in between the numbers.

What is the law of friction?

There is no fundamental, universal ‘law’ of friction.

Introductory Physics courses divide ‘friction’ into two types, Static (with no relative motion between the two interacting objects) and Dynamic (where there IS relative motion, sliding, that occurs between the two objects).

Static friction is sorta magic because it’s value ranges from zero up to a maximum value given by a simple formula given by the normal force that is pressing the objects together multiplied by a ‘pure number’ (no units) called the coefficient of static friction.

Dynamic Friction is bit less hokey in it’s formula. Dynamic friction is always equal the Normal Force which presses the objects together multiplied by the coefficient of dynamic friction.

Both forms of friction, as given by these rules, are independent of the area of contact between the two objects. This is approximately true. People who design and use tires for race cars depend on Reality instead of these Simplistic Rules.

The study of Friction is an extremely important area of study in both Engineering and in Physics. (i.e. it’s Complicated)

Answer 2

Answer
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⚫Friction

◾It is the force which opposes the relative motion between two surfaces of bodies in contact.

⚫ Laws of Friction

◾Frictional force is directly proportional to the normal reaction.

◾The frictional force depends upon the nature of surface of bodies in contact and their roughness.

◾The frictional force does not depend on the area of surfaces of bodies in Contact.

◾The direction of frictional force is parallel to the surfaces of bodies in contact and opposite to the motion of the bodies.

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