STOPPING DISTANCE - Mid-America Transportation Center › ... ›...
Transcript of STOPPING DISTANCE - Mid-America Transportation Center › ... ›...
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STOPPING DISTANCENick Reding
Papillion LaVista High School
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OBJECTIVES
Students will calculate the average speed of traffic
Students will caclulate the stopping distance for vehicles with different coefficients of friction and inital speeds
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MATERIALS
Measuring wheel or tape measure
Timers
Calculators
Radar gun (optional)
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RAISE YOUR HAND IF YOU...ARE BETWEEN THE AGES OF 10 AND 24 YEARS OLD
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WHY STOPPING DISTANCE?
Road traffic crashes are the leading cause of death among young people between the ages of 10 and 24 years old.
Speed limits are posted for a reason; to keep drivers, passengers, and pedestrians safe.
During inclimate weather (rain, snow, ice, etc.) extra caution must be taken while driving.
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BRAINSTORM
What are some possible factors that affect the stopping distance for a car?
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BRAINSTORM
Initial speed of car
Coefficient of friction between tires and road
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WHAT DO YOU THINK?
How many seconds should you leave between you and the car in front of you?
What about if it is raining or snowing?
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TERMS
speed -
acceleration -
friction -
coefficient of friction -
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TERMS
speed - rate of change of position (or how fast something moves)
acceleration - rate of change of speed (how quickly something speeds up or slows down)
friction - a contact force between two objects that rub against eachother (the friciton between tires and the road is what slows down a car)
coefficient of friction - the ratio of frictional force to normal force (the higher the coefficient, the more friction there will be)
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TODAYS LAB
Prediction
Part I - Average Speed Data Collection
Part II - Dry road
Part III - Wet road
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REAL WORLD CONNECTION
Car safety research is done right here in Nebraska...
UNL College of Engineering http://www.engineering.unl.edu/
Midwest Roadside Safety Facility http://engineering.unl.edu/specialty-units/mwrsf/
Nebraska Transportation Center http://ntc.unl.edu/
Mid-America Transportation Center (MATC) http://matc.unl.edu/