Why does a car roll back on an uphill slope?

[LaJude]

Rolling back on an uphill slope is generally due to improper braking or insufficient vehicle power during startup. It is recommended to try releasing the clutch more and then releasing the brake. Lift the clutch with your left foot until the car shakes and stops moving, lightly press the accelerator with your right foot, then slightly lift the clutch a bit more with your left foot, and the car will move forward. The key is to coordinate the pressing of the accelerator and the lifting of the clutch well. Fuel-saving tips when driving uphill: 1. When shifting from a higher gear to a lower gear while climbing a slope with a heavy load, do not wait until the car's momentum is lost before shifting; instead, shift gears appropriately in advance, otherwise it will be difficult to shift into a lower gear. 2. Do not climb a slope at high speed in a low gear. 3. Do not press the accelerator hard to climb the slope reluctantly, as this consumes more fuel than climbing to the top of the slope at the economical speed of a lower gear. 4. Do not accelerate to rush up the slope just before reaching it; instead, make an appropriate estimate of the slope's size and length in advance and accelerate early.