Friction in cars are produced by the tires and the clutch. The friction caused by the tires allow the vehicle to stay on the road, while the friction produced by the clutch makes it possible for the car to get moving. While gravity, for example supplies the force that pulls the vehicle down the hill.
Gravity.
Gravity itself does not slow things down (the Moon still keeps going round the Earth and the Earth still keeps going round the Sun). It's friction that slows things down. I have to say that there is likely to be more friction if there's more gravity but that's a secondary effect.
friction, air resistance and gravity
gravity, friction, driving force and wind resistance..
The car is being acted upon by gravity and friction. The reason that the car doesn't slide down the hill is because friction is keeping the car in place.
Without gravity, and friction the race car would be flying everywhere and would slide off of the track.
gravity and friction
Friction, air resistance, momentum, gravity.
The speed of a rolling car is affected by factors such as the incline of the road, the weight of the car, the condition of the tires, and the force applied to propel the car forward. Friction with the road surface and air resistance also impact the speed of a rolling car.
Air Resistance mostly, and small amounts of gravity and friction with the road.
The force of gravity must be greater than the force of friction between the ramp and the car's wheels. This allows the car to overcome the resistance and move down the ramp.
'Gravictism'? (Formed from Gravity, Friction and Magnetism)