Tire Impressions and Accidents

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Presentation transcript:

Tire Impressions and Accidents

Tire impression can tell a lot about accidents involving cars Speed of driver Which driver is at fault

Skid marks Produced by friction between tires and road Friction always opposes direction of motion Depends on type of surface and how hard they are pressed together

Speed Determined by length of skid marks and drag factor Drag factor = friction force / weight Determined by drag sled or accelerator attached to car Higher the value more friction involved with surface

Common drag factors

Calculating the Speed of car Determines the minimum speed that could cause the skid marks for any vehicle Speed = √(30*distance*drag factor) S = √(30*d*f)