Also, what makes Manual and Automatic vehicles different?
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This video is excellent for the manual transmission.
[https://www.youtube.com/watch?v=wCu9W9xNwtI](https://www.youtube.com/watch?v=wCu9W9xNwtI)
For automatic, watch this one.
[https://www.youtube.com/watch?v=u_y1S8C0Hmc](https://www.youtube.com/watch?v=u_y1S8C0Hmc)
Someone else will have to do the bike gears.
Internal combustion engines (which, interestingly, include humans) only operate efficiently within a narrow speed range.
The problem is that if the engine connected directly to the drive axle, such a vehicle would also have a very narrow speed range: you could drive in the city or on the highway, but not both.
Desirable vehicle speed ranges vary by an order of magnitude more (i.e. must be able to go 10 km/h or 120 km/h).
While most passenger vehicle engines idle at about 1,000 rpm and have a redline ≈ 7,500 rpm – 9,000 rpm, their optimum cruising speed is about 2,000 rpm.
To make this work, the vehicle needs to be able to change how many times the ctankshaft turns to make the wheels turn once.
So at parking lot speeds, the crankshaft might turn 10 or, 20 times the wheels go around once. Whereas on the highway, the crankshaft and wheels might turn at precisely the same speed.
As you move up through faster gears, the engine must produce more torque to turn the wheels because each crankshaft revolution is responsible for delivering a larger portion of the momentum change needed to accelerate and overcome drag. If you try to get going from a stop in your highway gear, your engine stalls because it can’t produce enough torque to deliver the desired acceleration.
As well, the engine and gearbox must be connected by some kind of slipping apparatus to allow the engine to run while the vehicle is stopped.
Drivers ib vehicles with standard transmissions operate the clutch and manually select gears. Sensing vehicle speed and power demand, automatic transmissions automatically shift between gears, relieving the driver of the burden of using a clutch and of knowing how/when to shift between gears.
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