Coulomb or dry friction is the force that opposes the relative motion or tendency toward such motion of two surfaces in contact. This force is due to the imperfections of the surfaces. In the Coulomb model, μ is the coefficient of friction, which is a constant that depends on the surfaces at touch, and the friction force is this coefficient times the normal force, μN, which acts on the opposite direction of motion.
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Friction

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Friction
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TIN FRICTION 51 SUPER BUICK OPEN FAT CAR MASUDAYA JAPAN US $9.95 Green Plastic Army Tank - Friction - Nice Item - L@@K!! US $14.99
Vintage Tin Litho Race Car No. 3 Japan US $9.99 VINTAGE LUCKY TOYS FRICTION FORMULA 1 RACE CAR YARDLEY US $9.99
YONE POLICE PATROL JEEP AND BOX US $89.99 TAIYO JAPAN TIN EMERGENCY JEEP AND BOX US $75.00
1950s TIN FRICTION TOY JAGUAR ROADSTER JAPAN W/BOX BOTT US $14.99 VINTAGE FRICTION TIN LITHO AMBULANCE W/SIREN ORIG BOX. US $9.99
VINTAGE FRICTION TIN LITHO HELIKOPTER LENDULET ORIG.BOX US $14.99 LOT OF 2 1960'S TIN FRICTION SPORTSCARS-JAGUAR-MERCEDE S US $5.99
Energizer 2016 3V Watch / Calculator Battery (2-Pack) US $4.98 Star-Kist Tuna Tin Toy Truck Cowboy Trailer Haji Japan US $5.00
Vintage ABC FREIGHT Friction Truck US $25.99 CHEVROLET FRICTION ORANGE TIN TOY TRUCK US $9.99
Friction Car - Lucky Sports Car - In original box US $14.99 59 LINCOLIN SW 8 EMERGENCY REAL CLEAN US $24.99
60 CORVAIR BY ICHIKO JAPAN US $24.99 VW BUS BY BANDAI US $24.99
1960s Navy Grumman Panther Tin Friction Jet Plane 12.5" US $19.99 1950s Tin Friction USA Army Willys Gun Jeep & Gunner! US $9.99
VINTAGE WIND UP TRAIN LOCOMOTIVE ENGINE FRICTION TOY US $9.99 Friction Travelling Car - Unique Antique item US $4.99
1956 Ford Thunderbird Convertible Friction Car US $19.99 HUGE JAPAN TIN FRICTION NAVY JET W/RELEASABLE TANKS US $9.95
Friction Car - Made in China - Good Condition US $14.99 RARE VINTAGE Asahi JAPANESE FRICTION DC TRANSIT TIN BUS US $256.00
VINTAGE TIN JAPAN FRICTION US AIR FIGHTER PLANE NMIB US $95.00 VINTAGE BANDAI LICENSE PLATED FRICTION THUNDERBIIRD BOX US $95.00
VINTAGE JAPAN TIN FRICTION PICK UP DUMP TRUCK NMIB US $95.00 Friction Model (?) Pickup Truck US $7.99
Vintage "Santa Fe Diesel" Tin Litho Friction Train US $9.95 Vintage Tin Friction Greyhound Bus -Mint in Box - Japan US $9.99
VINTAGE TIN LITHO EXCLUSIVE TRANSPORT CORP TOY TRUCK US $9.99 Nice Vintage Red Tin Friction Mercedes Tented Windows US $9.95
1950s Tin Friction Japan Super Robot Tank Car US $26.75 1950s Tin Friction Japan Joe's Kitchen Wagon Truck US $24.00
American Airlines Friction Inflatable Jet 1960 vintage US $48.00 UNMARKED TIN FRICTION MOTORCYCLE BALLON CORDATIC LEMEZ US $9.99
MARX VINTAGE PLASTIC DICK TRACY FRICTION CAR RARE! US $29.99 TOY RACE CAR_POP SECRET_CHEERIOS_GOLD METAL US $2.00
TIN LITHO MOUNTAIN LOCOMOTIVE FRICTION TOY TRAIN ENGINE US $9.99 VINTAGE RED TIN LITHO FRICTION CATTLE TRAILER TRUCK US $9.99
BOX FOR DISTLER CAR Germany ( rare box ) US $35.00 BOX FOR ICE CREAM TRUCK US $35.00
BOX FOR SPEED BOAT WITH SKIER ( rare box ) US $40.00 Disney Marx Minnie Mouse w/ Buggy Ramp Walker w/ Packag US $16.57
1950s MT Toys Japan X-6 Rocket ~ Friction US $8.49 (2) VINTAGE TIN FRICTION ARMY JETS MADE IN JAPAN US $4.99
1970's Robot Space Gun w/Carry Case (Bandai) it works! US $9.99 TOMY plastic motorized speedboat-works in bathtub Macao US $2.77
MAR USA TIN LITHO FRICTION SUPER CHIEF TRAIN ENGINE US $19.99 Four New Tin Toys - Made in China US $9.99
VINTAGE JAPAN US ARMY FRICTION TANK US $5.99 50's Tin Friction Cragston Toy Acrobatplane Japan AS-IS US $9.99
1955 CHRYSLER 4DR. BANDAI OF JAPAN FRICTION MOTOR WORKS US $9.99 1955 CADDY 2DR. JAPAN US $12.49
1955 VOLKWAGON 2DR. BEETLE MINT JAPAN US $9.99 NORTHWEST AIRLINES FRICTION AIRPLANE TOY WITH CAR&TRUCK US $9.99
Tin Friction Main Street Bakery Van Bread Truck Japan US $158.49 1955 FORD FAIRLANE 2 DR.STATION WAGON MARUSON JAPAN US $89.00
1960 FORD FAIRLANE 2 DR. H-TOP OPEN HOOD MADE IN JAPAN US $192.16 Vintage 1950's Japan Tin BUTTERFLY Friction Toy US $5.99
2 SPITFIRE HELICOPTER zoom flying copter toy kid toys US $9.99 1920s Camouflage Sparkling Tank Windup US $10.16
1950s Schuco Micro Racers #1040 & #1043 w/ Key US $17.16 FRICTION PASSENGER PLANE MINT IN BOX US $8.99
Vintage Tin Friction Motorcycle 8 1/4" long works US $9.99 Wind up tin toy Red Racer Number 8 US $8.00
VINTAGE MATTEL TRAIN LOCOMOTIVE ENGINE FRICTION TOY US $7.99 JAPANESE TIN FRICTION JEEP - 2 5/8 INCHES - MARKED JEEP US $8.99
VINTAGE Big Machine Friction Powered Airplane IN BOX US $50.00 NEAR MINT----25.5 INCHES----1965 CADILLAC---NOMURA (TN) US $372.00
North American Van Lines Tin Friction Trailer Toy w/Box US $11.61 ASC Volkswagen Bus Fire Truck W/Ladder Friction 12-3/8" US $99.99
VINTAGE BATTERY OPERATED JALOPY VERY NICE HAVE A L@@K US $9.99 Vintage Marx Super Chief Tin Friction Locomotive US $9.88
T- BIRD FRICTION CAR VERY NICE HAVE A L@@K !!!!!!!! US $9.99 BUICK FRICTION CAR VERY NICE HAVE A L@@K !!!!!!!!! US $9.99
1950s Disney Sutcliffe Nautilus Submarine Box W/Insert US $9.99 Marx Race Car Driver Head and Body Original - not repo US $8.95
Old Friction Powered MARX Tin Litho Fire Truck 1950s US $29.99 1980'S FORMULA 1 F1 CAR FRICTION CAR BOXED HONG KONG US $30.00
1980'S JUMBO JEEP FRICTION CAR BOXED MADE IN HONG KONG US $30.00 Marx Friction Drive Airplane,with Box,1940's US $23.16
SCARCE 1920s-30s Wood & Cardboard Indian Ramp Walker US $18.27 1930 Marx Amos 'n Andy Fresh Air Taxi US $19.28
Two U.S. Zone Germany Racers #5 & #11 ~ 4" Long US $7.70 Vintage Metal Toy Friction Car Deluxe Open Sedan MF317 US $9.99
Early 1900s Germany Fischer Saloon / Limousine 8" Long US $7.70 1960s Germany Kohler Wind Up Win Litho Bird w/ Key US $7.70
Vintage Tin Friction Daiya Delivery Van Truck w Box KTS US $57.00 FORD MUSTANG 1967 F/Back Friction Oper. AMT Boxed RARE US $49.99
Wind Up Tin Toy San Francisco Cable Car US $11.00 1950 TIN CADILLAC FRICTION SEDAN US $9.99
VINTAGE US ZONE GERMANY WIND-UP CAR SCHUCO GAMA-PATENT US $4.25 BAY & TAYLOR STS MUNICIPAL RAILWAY TIN PLATE FRICTION US $9.99
Bandai Mercedes Benz 300SL Friction 8" Japan Tin NR US $39.99
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Prices current as of last update, 07/03/09 10:49pm.


See also...
1970-Now, Friction, Electronic Toys
Pre-1970, Friction, Electronic Toys
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