6.7 A pneumatic-tired tractor with a 354-hp engine has a maximum speed of 3.6 mph in first gear.   Determine the maximum rimpull of the tractor in each of the indicated gears if the engine efficiency is 91%.   Gear         Speed eed (mph) First            3.8 Second       6.5 Third         11.5 Fourth        20.0   2 .The tractor weighs 31.7 tons. It is operated over a haul road having a slope of +1.2% and a rolling resistance of 84 lb/ton. Determine the maximum external pull by the tractorin each of four gears.

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Friction

Friction is defined as the force that prevents any solid surface, any layer of fluid, or any kind of element or material from sliding.