CFU: 2.2 Accident Investigation Data

John's car left four skid marks on the road after he slammed his foot on the brake pedal to make an emergency stop. The police measured them to be 40 ft, 40 ft, 38 ft, and 38 ft. What skid distance will be used when calculating the skid speed formula?

Answer: _ mph

Mathematical Equivalence

ON

Amy was driving on a road that had a 35 mi/h speed limit posted. A deer jumped out from the side of the road, causing Dayling to slam on her brakes. Her tires left three skid marks of lengths 90 ft, 93 ft, and 94 ft. The road had a drag factor of 0.78. Her brakes were operativing at 95% efficiency.  

Find the Skid Speed. Round to the nearest whole number.

Answer: _____ mph

Mathematical Equivalence

ON

An accident reconstructionist takes measurements of the yaw marks at the scene of an accident. What is the radius of the curve if the middle ordinate measures 6.8 feet when using a chord with a length of 60 ft? Round your answer to the nearest tenth of a foot.

Answer:

r= _______ feet

Mathematical Equivalence

ON

The following measurements from yaw marks left at the scene of an accident were taken by law enforcement officers. Using a 25-ft-long chord, the middle ordinate measured approximately 4 ft. The drag factor for the road surface is

1.05.

1. Determine the radius of the yaw mark to the nearest tenth of a foot.

3. r=_______ feet

Mathematical Equivalence

ON

The following measurements from yaw marks left at the scene of an accident were taken by law enforcement officers. Using a 25-ft-long chord, the middle ordinate measured approximately 4 ft. The drag factor for the road surface is

1.05.

1. If the radius is 21.5 feet, calculate the minimum speed of the car when the skid occurred. Round to the nearest tenths.

3. Y= ____ mph

Mathematical Equivalence

ON