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FRICTION. FRICTION DEFINITION  Friction occurs when 2 objects are in contact with each other. The objects apply or exert a force on one another during.

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Presentation on theme: "FRICTION. FRICTION DEFINITION  Friction occurs when 2 objects are in contact with each other. The objects apply or exert a force on one another during."— Presentation transcript:

1 FRICTION

2 FRICTION 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

3 FACTORS 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

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

5 DIRECTION 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.

6 STATIC FRICTION Definition:  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.

7 HOW TO “OVERCOME” STATIC FRICTION  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

8 SLIDING FRICTION Definition:  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

9 USEFULNESS OF SLIDING FRICTION  It can keep you from slipping, sliding and falling (example: sand on an icy road)!

10 ROLLING FRICTION Definition:  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.

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

12 FLUID FRICTION Definition:  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

13 USEFULNESS 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.


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