HOW NOT TO SLIP AND FALL IN BATHROOM

We mainly talk about electric, magnetic, gravitational and nuclear forces. But the frictional force also plays important role in our daily life.
How the frictional force arises? When one body moves over another body, a opposing force called friction arises. When liquid flows, it flows in layers and here the frictional force is called viscous force. Irregularities in the contacting surfaces, adhesive force between the surfaces and gravity also contribute to the frictional force. Friction is responsible for everyday activities like eating, drinking, writing, walking etc. Without friction "there will be many slips between the cup and the lip"

MEASURE OF FRICTION

'Co-efficient of friction" is used to measure the friction. It is the ratio between the force which is just enough to move the body' and the weight of the body (in simple terms). It normally falls between 0 and 1. The bathroom tiles should have this value from 0.4 to 0.7. Higher the value, more safe we are.
Gravity facilitate friction. Because the gravity brings objects together. In space, no gravity hence no friction.
Friction creates heat. That is why match box works. In the microwave oven, microwave agitate water molecules in the food and friction arises and warms up the food.
Rail road reduces the friction greatly. Hence the train is able to carry lot of people and load with less energy. But still, the ticket is costly because of overhead charges and maintenance.
All the automobiles and machines require oil and ball-bearings to reduce friction. Without oil, they will consume lot of energy and wear out quickly.
Hence, the friction is "the necessary evil" . Give the devil its due.
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