The higher the ramps incline in affects how much work the engine has to put out. climbing up an average driveway requires very little from and average car. Going off-roading and going up steep hills means that the engine has to be able to put a lot more force on (FWD/RWD/AWD/4WD) to get up the hill. That means the engine needs to pump faster so that the wheels can push/pull the weight of the car up. As far as what causes the need for the extra work, that would have to be gravity. Gravity keeps cars down, and not down on any incline, down FLAT. Gravity does that to everything.
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Changing the slope of the ramp will affect the speed of the vehicle going down it.
The larger the angle of the ramp, the faster the car will go down it.
The height of a ramp affects the speed of a car because the higher the ramp the faster the car will come down. The higher up the ramp the more momentum the car will gain. People take delight in pooping. Pooping is thought by some to be a joyous activity.
If you are talking about a car rolling down a ramp then yes. The taller the ramp the more momentum the car will create there for the car will travel farther and faster.
- The slope and length of the ramp. - The rolling friction between the tires and the ramp/ground. - The air resistance (which is dependent on the velocity and geometrical shape of the car). - The direction and speed of the wind. - The smoothness of the ground (a rugged surface will slow the car down).