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Once you have achieved highway speed, you would stay in the highest gear, except for steep uphill or downhill grades.
Going uphill, the vehicle engine is under stress while also being part of the weight holding the car back. In old cars pre-1970s, we often had to downshift into low to just maintain any amount of speed to get up a steep hill. Today's automatic engines do the auto shifting much easier than in older auto transmissions.
it is both kinetic and potential energy
its getting ready to explode. jump out quick
Driver use gear 'L' or '2' when driving uphill or downhill which required higher gear ratio to move the uphill. Downhill wise, driver use '2' or 'L' for safety purpose. The low gear ratio will use the high gear ratio to slow down the speed of driving downhill and creating 'pulling' force on your car to safety purposes. Gear '2' can be use for overtaking on the highway too provided at the appropriate speed.
With a forklift, carry the load on the uphill side.
because it is going uphill and the engine has to work harder?
You're driving an automatic, the car should select the correct gear for you. However some automatics allow the driver to select low gears for use in slow moving traffic for example. If you feel you need more power when driving uphill then select one of the lower gears.
Gravity adds a force (kgs) going downhill = sin (incline angle) * mass vehicle (kgs) and detracts the force when going uphill (same equation)
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whichever vehicle was the one traveling uphill
If a Volkswagen Jetta loses power while driving uphill, one possible explanation is that the mass airflow sensor has gone bad. Another possibility is that the intake manifold could be clogged. The only way to know for sure what's wrong is to take the car to a mechanic.