# Understanding Friction: Definition and Factors that Affect It

Friction is a force that occurs when two objects are in contact. This force resists the motion, acting in the opposite direction. In this article, we will explore

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## About Understanding Friction: Definition and Factors that Affect It

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## Presentation Transcript

Slide1FRICTION

Slide2FRICTION DEFINITION Friction occurs when 2 objects are in contact with each other.  The objects apply or exert a force on one another during this time.  Friction acts in the opposite direction of motion  – so it is the force that resists movement ! share.ehs.uen.org

Slide3FACTORS THAT AFFECT FRICTION How hard the surfaces push against each other  – the more force, the higher the friction  The type of surfaces involved  – the smoother the surface, the lower the friction www.waveequation.com

Slide4FRICTION AND SMOOTH SURFACES Even apparently smooth surfaces actually have microscopic irregularities and bumps.   When these come in contact with another surface friction occurs. www.mrteverett.com

Slide5DIRECTION OF FRICTION Friction acts in the  opposite direction of motion , so if the object moves towards the right the  frictional force will be towards the left . www.physics4kids.com

Slide6STATIC FRICTIONDefinition:  The friction that  occurs when objects are not moving.   It is the friction that  keeps objects in place . Example:  A box sitting on the ground, your books sitting on a table, your backside against the chair .

Slide7HOW TO “OVERCOME” STATICFRICTION  The  force  needed to start an object moving  must be greater than the static friction .  Reason why a greater force is needed to start an object moving than to continue it moving education-portal.com

Slide8SLIDING FRICTIONDefinition:  The friction that  occurs when 2 solid objects move against each other  (or 1 object moves over another) Example:  Bicycle brakes, skinning your knee, walking, writing

Slide9USEFULNESS OF SLIDING FRICTION It can keep you from slipping, sliding and falling (example: sand on an icy road)! www.goalvanise.com

Slide10ROLLING FRICTIONDefinition:  The friction that  occurs when an object rolls across a surface .  Easier to overcome than sliding friction. Example:  Anything with wheels (cars, skateboards) or a ball rolling. www.school-for-champions.com

Slide11ROLLING FRICTION AND ENGINEERS Engineers use ball bearings to reduce friction – the ball bearings roll between moving parts. news.thomasnet.com   www.hartfordtechnologies.com

Slide12FLUID FRICTIONDefinition:  The friction that  occurs when a solid objects moves through a fluid .  A fluid is a  gas or liquid  – they flow easily!  Easier to overcome than sliding friction. Example:  Anything moving through the air or water: riding a bike, surfing, swimming, sky diving

Slide13USEFULNESS OF FLUID FRICTION Parts of machines move more easily when they are oiled.  Fluid friction is what slows down a skydiver when the parachute is opened.