High Speed
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Why does high speed need less torque to keep the motorcycle moving?
At high speed, we shift at higher gears which exert much less torque on to the wheel. Why does at high speed, we need less torque to keep the motorcycle moving?
The only reason for torque T = fr when up and running steady, no matter what the rpm, is to overcome the friction in the hubs that would stop the wheels if a net force f were not imposed on the wheel hubs with radius r.
The net force f = ma = P - F is applied to the hubs, where F is the friction force acting in the direction opposite to P which is the power force pushing the hub around. As you can see, when the cycle is at constant speed and a = 0, P = F, meaning the only torque Pr needed to keep going is whatever it takes to offset the friction torque Fr.
But as the cycle is accelerating and a > 0, we need P - F > 0 meaning Pr > Fr and the torque applied Pr must exceed the frictional torque Fr. So we need more torque to get up to speed, but once we're there we can back off a bit to keep up whatever speed we've gotten to.
Items recently purchased from this site
Kitako VT4-350 (high speed, 4 spindle, automatic, CNC, lathe, vertical, turret), Kitako HS4200 (high speed, Gantry, automatic, CNC, lathe, FANUC, spindle), Bielomatik P233 High Speed Binding System, CNC Milling Profiler 20 HP Tool Changer High Speed , Machining Center Horizontal High-Speed Mazak FH-4800 , B30115 MINSTER P2-100-48 HIGH SPEED PRESS, IMA Matic 90 High Speed Capsule Filler , B27253 MINSTER P2-150-54 HIGH SPEED PRESS, 150 Ton Minster P2-150-60 High Speed Stamping Press , 1991 250 Ton Cincinnati OBS 250 CNC High Speed, Hydraulic Gap Press, B29077 MINSTER P2-100-48 HIGH SPEED PRESS, B30114 MINSTER P2-100-48 HIGH SPEED PRESS, 150 Ton MINSTER P2-150-48 High Speed Punch Press, 1967, SSI Model 2000-H Slow-Speed/High-Torque Shredder with Pneumatic Ram, B25559 AIDA PDA-20H HIGH SPEED STRAIGHT SIDE PRESS, Makino S56 High-Speed CNC Vertical Machining Center, YAMADA DOBBY #FP-110SW 110TON HIGH SPEED STRAIGHT, 2008 Xerox iGen3 110C High Speed Digital Production Printing Press, 150 TON MINSTER P2-150-54-40 HIGH SPEED SSDC PRESS, 250 TON BLISS HIGH SPEED PRESS HP2-250-72-42, 125 Ton MINSTER PM2-125-48-32 High Speed Punch Press, NIAGARA PB2-200-60-36 HIGH SPEED SSDC PRESS, MIKRON MODEL HSM-400 3-AXIS HIGH SPEED VERTICAL MACHINING CENTER FOR GRAPHITE EL, B27089 MINSTER TR2-60 PULSAR HIGH SPEED PRESS, B29064 MINSTER TR2-60 HIGH-SPEED PRESS, NEW GoldPro® DCS High Speed 250 Ton Hydraulic Coining, Forging, Stamping Press , 10746-001 Alfa Laval High Speed Separator, model AX-213S-31B-60 , 150 Ton PACIFIC High Speed Hydraulic Press Former, PULLMASTER HL-25 HIGHSPEED WINCHES WITH WALKAWAY MANIFOLD, Very nice 75 Ton Bliss High Speed Straight Side Press, B22731 BRUDERER BSTA 30 HIGH SPEED PRESS, 250 TON PACIFIC PRESSFORMER HIGH SPEED HYDRAULIC GAP FRAME PRESS VERY NICE 1983, Nagel High Speed 5 Spindle Vertical Honing Machine, Minster P2-30, 30 Ton High Speed Press, B22970 BRUDERER BSTA-20H HIGH SPEED PRESS, B23561 BRUDERER BSTA20 HIGH SPEED PRESS, B26722 OAK 42LP-150 HIGH-SPEED PRESS, 150 Ton FEDERAL S2-150-60-36 High Speed Punch Press,'78, 60 Ton MINSTER #P2-60-36 High Speed Press, New 1975, NEW HWACHEON HL580 LATHE HIGH SPEED PRECISION 23" SWING, Bruderer 30 Ton Highspeed Stamping Press BSTA 25 4 Post, 30 Ton Minster Pulsar TR2-30 High Speed Press w/ Feed, SOLLAS M-100 HIGH SPEED OVERWRAPPER, B26425 OKADA GMC654 GRAPHITE MASTER HIGH SPEED GRAPHITE, PAI 4500 Case Palletizer High Speed up to 60 cpm, Oak Model 30-SS-30-570 High Speed Straight Side Press, 2007 GBC Voyager High Speed Laminator , 40" Wide Brown T300 High Speed Trim Press, Amada 1/4" X 13' High Speed Mechanical Shear , MAKINO SNC-86 HighSpeed CNC Vertical Mill Leblond SNC86, SHING TAI 1999 35 TON HIGH SPEED PUNCH PRESS 1100 SPM, #SNC106 LEBLOND MAKINO High Speed "Graphite" VMC ('93), B27294 MINSTER "PULSAR" TR2-30 HIGH-SPEED PRESS, B28030 MINSTER TR2-30 HIGH-SPEED PRESS, 5" OMP High Speed Cutting Line Euromatic 370CS (19902), DEOKWOO HIGH SPEED GRANULATOR, MARVEL SPARTAN PA 10/3 HEAVY-DUTY, HIGH SPEED, HYDRAULIC, HORIZONTAL, METAL CUT, Minster TR2 Pulsar 30 Ton Stamping Press SSDC High Speed , ABB FBK-H High Speed DC Power Circuit Breaker, 10,000 AMP, 800VDC, B25753 MINSTER TR2-30 HIGH SPEED PRESS, B25754 MINSTER TR2-30 HIGH SPEED PRESS, B26224 PRECISION PS2-100 HIGH-SPEED PRESS, 20 Ton MINISTER High Speed Punch Press, A.M.S. High Speed Extrusion Winder, FELLOWS #7 HIGH-SPEED GEAR SHAPER. NEWEST AROUND! , HE&M Horizontal high speed Steel band saw H160m 25" , Amada 10x3/16 Power shear High speed Mechanical w-Accessories Nice-Unit, Rose Forgrove High Speed Flow Wrapper, GEC Alsthom SW02AE-001 High Speed Circuit Breaker, Jacobson High Torque Slow Speed Knife Shredder w/ 25hp, 3/8" X 10' Niagara High Speed Mechanical Shear , MINSTER Piece Maker 30 Ton High Speed Straight Side Press w/ PLC Control, 45 TON MINSTER P2-45-32 HIGH SPEED SSDC PRESS, PHILADELPHIA HIGH SPEED REDUCER #226-09 RATED 1800 HP 5400 RPM INPUT 600 OUT, 45 Ton MINSTER #P2-45-32 High Speed Punch Press,1960, Gromax Precision High Speed Lathe GLA-1744 17" Swing 44" center Made in Taiwan, Ledco High-Speed 30" Thoroughbred Laminator - 1300220, Philips Sapphire PA131010 High Speed Placement System, PMJ Cencorp - HiSAC 1000 BR High Speed SMT Robotic PCB Router Depaneler Machine, NEW FLAGLER HIGH SPEED QUADFORMER ROLLFORMER, MINSTER 22 TON HIGH SPEED OBI PUNCH PRESS,VAMCO FEED,NR, B26187 MINSTER P2-45-32 HIGH-SPEED PRESS, FELLOWS HIGH SPEED GEAR SHAPER w/ TOOLING, Brand New Canon imageFORMULA DR-X10C High-speed Scanner, 30 Ton Minster Pulsar TR2-30 High Speed Press w/ Sankyo Feed (2) Available, GMC BIG BORE GML-2580 HIGH SPEED PRECISION LATHE 25" x 80" - NEW, Used- Schold Variable High Speed Disperser, Model 30 VH, Mekel M625 high speed microfilm scanner, Mekel 625 High Speed Microfilm Scanner, complete setup, Arri SR2 High Speed Camera Denz Video Assist PAL , Rose Forgrove High Speed Flow Wrapper, MOORE #3 JIG GRINDER W/ 40M-4247 HIGH SPEED HEAD & DRO, 2003 NEW HOLLAND LS180 SKID STEER LOADER SKIDLOADER HIGH FLOW , 2 SPEED, LOW HR, USED: High speed dispersing mixer. Carbon steel/stainle, NAC E-10 PHOTO-SONICS WORLD'S BEST 16MM HIGH SPEED CAMERA 10000 FRAMES ARRI LOOK, 150 LITER PAPENMEIER HIGH SPEED MIXER, S/S, 3 S..., 200 LITER PAPENMEIER HIGH SPEED MIXER, S/S, JKTD. , NIAGARA 50TON GAP BED HIGH SPEED PRESS, Used- Western Gear High Speed Increaser, Model 200 HSCM,
