Because we do not want the car sliding out of the curved track. The piece of tyres in contact with the asphalt should not move relative to it.Tahmeed said:Homework Statement
The sports car ) is rounding a flat, unbanked curve with radius R . If the coefficient of static friction between tires and road is Us, what is the maximum speedat which the driver can take the curve without sliding?
why in this problem i am given Static fiction coefficient instead of kinetic?
Friction relates to surfaces in contact. The choice of static or kinetic friction is determined by whether there is relative motion between the two surfaces. The motion of the car is not important; what matters is whether the part of the tyre in contact with the road is moving relative to the road - i.e. skidding.Tahmeed said:why in this problem i am given Static fiction coefficient instead of kinetic?
That's not really the key. An accelerating car on the flat can experience static friction in the direction of motion without skidding.CWatters said:Which direction is the friction acting?
Is the car moving in that direction?
haruspex said:That's not really the key. An accelerating car on the flat can experience static friction in the direction of motion without skidding.
Static friction is often greater than kinetic friction because when an object is at rest, the surfaces in contact are able to conform to each other and create more points of contact, leading to a greater amount of friction.
No, static friction can never be less than kinetic friction. This is because the surfaces in contact have already conformed to each other and created the maximum amount of points of contact, resulting in a greater amount of friction.
The force of static friction is usually greater than the force of kinetic friction, as it takes more force to overcome the initial resistance and start the object in motion.
Static friction is important in everyday life because it allows us to walk, drive, and perform other tasks without slipping. It also helps to keep objects in place and prevent them from sliding or falling.
The amount of static friction can be affected by the nature of the surfaces in contact, the weight of the object, and any external forces acting on the object. It can also be affected by the coefficient of friction, which is a measure of how rough or smooth the surfaces are.