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Can we do without friction?
Rubbing your hands together to make them warm.
Pushing a box across the floor.
What is common?
Write with a pencil
Playing football.
cause
Objects
contacts
making
FRICTIONFRICTION
A contact force that occurs when two surfaces oppose each other.
FRICTION
Sliding Friction
Static Friction
Friction between two solid objects that are not moving relative to each other.
Friction that occurs when an object slides over a surface.
Fluid Friction
Rolling Friction
Friction that occurs when a round object such as a ball or tire rolls on a flat surface.
Friction between layers within a viscous fluid that are moving relative to each other.
In various situations, friction is very important and beneficial.
Walk and Run Hold your Cup
Drive your Bicycle Apply breaks
Hammer your nail
Skiing through on the mountains Swim through water
Climb and Enjoy
Grindstone-sharpen a chisel Construction of buildings
Play gamesPaint your walls
Friction helps But a problem too…
Makes movement difficultExcess friction can make it difficult to slide a box across the floor, ride a bicycle or walk through deep snow.
Lubrication and use of ball bearings reduces friction.
Wastes energyFuel or energy is being wasted because of the friction.
Cars, airplanes and ships are streamlined to reduce friction.
Heats partsThe friction of parts rubbing together creates heat.
Wears things outAny device that has moving parts can wear out rapidly due to friction.
What will
happen without
Friction???
Slip while you run
Skid your bike
No fancy walls
Drown
No trekking
No Machines
No Flour
Friction – also known as necessary evil
As
Life is impossible without it.
We can minimize it but can’t get rid of it