its harmful to the engine, but without it your car could not move as the tires would just spin. can't have one without the other although things can be done to reduce it in the engine and increase it at the tires.
harmful friction is when friction can do harm or be a problem for example of this is if your skiing down a hill with grass you will have to much friction then you fall and get hurt :p
Friction can be harmful or helpful when driving, no matter what time of year. For instance it is helpful when breaking and it is harmful between bearing surfaces. The loss of friction between the tyres and the road during winter can be disastrous.
metal to metal.... worn out brakes, bad oil pressure
Car BreaksBike Breaks
Friction slows down a car. As such, in order to maintain the velocity of the car, energy, i.e. gasoline, is required due to friction.If there were no friction, an impossible state, the car would require no energy to maintain its velocity once it had achieved the desired velocity.
Cars don't get better gas or mileage.
friction can cause: 1) Physical wear and tear of moving parts. 2) degradation of materials by continuous friction. 3) wastage of 70% of energy in car engines. However, friction is useful in: 1) walking 2) car brakes, friction between brake pads and Tyre causes car to slow down. 3) techniques like friction welding.
Ways that friction are beneficial: Standing - Friction allows you to stay in position instead of moving around even when you do not want to Braking of cars - Similarly, friction makes it possible to make a car stop Ways that friction is nuisance: Wear and tear - Friction produces heat, which would flatten shoe soles, smoothing the gears or other mechanics in machineries
the front boot of the car increases the friction on the car
Friction is what makes the brakes stop the car.
Friction does work to slow down the car. Thus, the more friction there is, the less distance a car can go.
Friction is de opposition of motion. if a car is in motion, the friction is said to be reduced because it oppose de movement of the car.