Yes to: "So for a, since it is skidding would only kinetic friction be used? ".PAstudent said:
I'm not quite sure what you are asking there. Are you asking whether the only difference in the two solutions is which coefficient you should use?PAstudent said:
As I indicated, you need to think about the direction in which the frictional force acts. The car is moving tangentially at some speed v, wheels locked, and skidding. If two surfaces are in sliding contact, which way is the force of friction?PAstudent said:
In case (a), yes, that is wrong.PAstudent said:
Friction is the force that opposes the motion of an object when it comes into contact with another surface. In circular motion, friction occurs between the object and the surface it is moving on, and it acts in the direction opposite to the motion.
Friction affects circular motion by slowing down or stopping the object's motion. This is because the force of friction acts in the opposite direction of the motion, reducing the object's speed and causing it to eventually come to a stop.
Friction can be useful in circular motion by providing the necessary force for an object to maintain a circular path. This is seen in situations such as a car turning around a corner or a roller coaster staying on its track.
The amount of friction in circular motion is affected by several factors, including the type of surface the object is moving on, the weight and shape of the object, and the speed at which it is moving. Rough surfaces, heavier objects, and higher speeds typically result in more friction.
Friction can be reduced in circular motion by using lubricants, such as oil or grease, to create a smoother surface for the object to move on. Additionally, reducing the weight of the object and decreasing its speed can also decrease the amount of friction.