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I have always gotten confused between the idea of when kinetic friction is applicable vs static friction. I've gotten the bulk of Force and friction and how to solve when needed except when both show up. I know that kinetic friction is always smaller than static friction because it takes more force to get a stationary object moving that one that is already moving. But, I have read up on something that really bothers me.
When a car is towed at constant velocity, the frictional force between the road and its tires is static and in the opposite direction to the motion of the car.
Yet, when a car moves under its own power at constant velocity, the frictional force between the road and the tires that propel the car is static and in the direction of the motion of the car.
When a car is towed at constant velocity, the frictional force between the road and its tires is static and in the opposite direction to the motion of the car.
Yet, when a car moves under its own power at constant velocity, the frictional force between the road and the tires that propel the car is static and in the direction of the motion of the car.
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