![]() ![]() Take a look at the next diagram.Īssume that this tire is rolling along the ground it is not sliding. You might be wondering how, exactly, a tire that is rolling along the ground is experiencing static friction (as opposed to dynamic). Have you noticed that it takes more force to get it moving than it does to keep it moving? That's because dynamic friction is less than static friction. To wrap your head around this, think about sliding a heavy box across the floor. Dynamic friction is always less than static friction, and that's why sliding tires are bad! Beyond that point, it can no longer prod ce any more resistance, and we begin to deal with dynamic friction. Static friction produces a force that resists movement up to a certain point. Now, why does that equation have a less-than-or-equal-to sign instead of an equals sign? That's because we're talking about static friction right now, which occurs between two objects that currently aren't moving. ![]() Remember that the force of the weight can change during acceleration and cornering because of weight transfer. The Normal force is equal to the weight the object is exerting on the ground. If the car is moving, weight transfer from cornering and acceleration will make the normal force increase or decrease. ![]() If the car is sitting still, it is simply equal to the weight of the car on that tire. The normal force (in the case of tires and cars) is the pressure that the ground is exerting upwards to hold the tire up. Ice has a low coefficient of friction, whereas rubber has a high one. Friction's coefficient varies depending on the two objects that are rubbing against each other. This says that the force of static friction (F) is less than or equal to the coefficient of friction (µ) multiplied by the normal force (N). The resistance to them sliding along each other is friction.įriction is a complicated thing, but fortunately, we can model it pretty well as a linear function: Friction is a force that resists the movement of two objects sliding along each other. ![]()
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