Answers

2015-09-03T15:34:22+05:30
Pushing a plate on a dining table gives a rough feeling but if you were to 'accidentally' drop some water and then push the plate, it would easily glide through. This is because the layer of water between the plate and the table reduces the friction.Below are some common ways to reduce the friction.Sub Topics
PolishingLubricationUse of ball-bearing or roller bearingBallStreamliningUse of correct combination of surfaces in contactWhy is it easier to pull a body than to push it ?
 
0
2015-09-09T22:39:49+05:30
Methods to Reduce FrictionPushing a plate on a dining table gives a rough feeling but if you were to 'accidentally' drop some water and then push the plate, it would easily glide through. This is because the layer of water between the plate and the table reduces the friction.Below are some common ways to reduce the friction.

PolishingBack to Top
Polishing the surface, reduces the irregularities and hence, reduces friction.LubricationBack to Top
It provides a layer of the lubricant on which the bodies can easily slide.Use of ball-bearing or roller bearingBack to Top
BallBack to Top
/roller bearing help to convert sliding friction into a milder form - rolling friction. Rolling friction is lesser than sliding friction.StreamliningBack to Top
Fast cars, boats, planes etc., have a streamlined body. This is to allow air (or water in the case of boats) to easily flow by, without offering much resistance.Use of correct combination of surfaces in contactBack to Top
Use of alloys on moving and sliding parts reduces friction because alloys have a low coefficient of friction.Why is it easier to pull a body than to push it ?Back to Top
If you have ever mowed the lawn using a mower, you would have noticed that pushing the mower is more difficult than pulling it.Have you ever wondered why?Let us try to understand this by a simple block and plane example.When the block is pushed, the vertical component of the push increases the normal force. Hence, there is an increase in friction.Now when you pull the body, the vertical component of the pull is in the opposite direction of the normal reaction and hence, reduces it, thereby reducing the friction.Hence, friction in (b) is less than friction in (a) Pulling a body is easier than pushing.
0