7 Factors affecting friction ( surface) http://www. bbc. co Factors affecting friction ( surface) ( visit this website)Smooth surfaceRough surfaceLesser bump and hollows means lesser frictioncan move the object continuously with little force.More bump and hollows means more frictionCan move the object slowly with greater force
8 Smooth surfaceThe smoother the surface the faster the object glides with little force
9 Rough surfaceObjects will move slowly with greater force on the rough surface.
10 Factors affecting friction Air ResistanceExample:Is the force that provide a backward forceSize and shape are the factors that affect air resistance. ( the bigger the size and shape the more is the air resistance)
11 Friction: Good and Bad Good Bad Hold objects Stops object Able to play ,run ,walk etcGives energyShoes, slippers , tires and anything that are used for moving are worn out.Machine become less efficientReduce speedCause accidentsCause sparks
12 Ways of reducing friction Applying wax or polishingUse rotating objectsStreamliningNew design shoes for the athletes