What is the angle between the wheel of a bicycle and the friction of the road ?

What is the angle between the wheel of a bicycle and the friction of the road ?
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Answer :

Friction always acts against the velocity of the object. Here, when the bicycle moves on a flat road, the mass of all bicycles acts downwards , at a steep 90 degree angle. This causes the reverse friction ball to block the bike in the opposite direction as the bike moves forward on the road surface. The friction that works against the rotational speed of a bicycle wheel is called rotational friction and the angle between them is 180 degrees.
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