1. Texting and Driving Physics of Paying Attention Stopping Distance Reaction Time

2. Not all bad drivers are women, but all women are bad drivers. True or False? Car Crash CompilationRacecar Crash Compilation Bad Drivers Compilation

3. Imagine your traveling in a car at 68mi/hr and you look away for one second to [change the radio station / check a text message / to look at the pretty trees / or any reason], why is it a bad idea to do this?

4. 1.Distance traveled in a second. 2.Human Reaction Time 3.Breaking Distance. 1.Distance traveled in a second. 2.Human Reaction Time 3.Breaking Distance.

5. 1.68mi/hr is the same as 100ft/s. So in that second you travel 100 feet! 1.68mi/hr is the same as 100ft/s. So in that second you travel 100 feet!

6. 1.Perception time (recognize the danger) 2.Reaction time (decide what to do) 3.Action time (pushing the break pedal). You are moving 100ft/s while this is going on! 1.Perception time (recognize the danger) 2.Reaction time (decide what to do) 3.Action time (pushing the break pedal). You are moving 100ft/s while this is going on! 1s = 100 more feet

7. WORK AND KINETIC ENERGY (KE = ½ mv 2 ) (W=Fd)

8. 1.At 68mi/hr its about 250ft. 2.This assumes: --roads are dry --your tires are in optimal shape --your breaks are good. 1.At 68mi/hr its about 250ft. 2.This assumes: --roads are dry --your tires are in optimal shape --your breaks are good.

9. 1.100 feet (looking away for a second). 2.100 feet (thinking and reacting). 3.250 feet (breaking distance). 450 total feet to stop! 1.100 feet (looking away for a second). 2.100 feet (thinking and reacting). 3.250 feet (breaking distance). 450 total feet to stop!

10. 1.~50 feet (looking away for a second). 2.~50 feet (thinking and reacting). 3.~60 feet (breaking distance). 160 total feet to stop! 1.~50 feet (looking away for a second). 2.~50 feet (thinking and reacting). 3.~60 feet (breaking distance). 160 total feet to stop!

11. d = stopping distance V i = velocity beforebraking in m/s U = Coefficient of frinction (0.8) g = acceleration due to gravity 9.8m/s 2 SpeedBreaking Distance 20m/s 40m/s 60m/s 80m/s This does not include reaaction time! If you double the speed of an object what happens to breaking distance? Breaking Distance 40m/s Breaking Distance 20m/s Breaking Distance 60m/s Breaking Distance 20m/s Breaking Distance 80m/s Breaking Distance 20m/s = = =

12. Car 30mph Is this a safe following distance? If both cars slam on the brakes at the same time their stopping distance is about 14m. The blue car would still be 8m in front of you because both cars have the same stopping distance. The problem is normally a car in front of you slams on their breaks and then you have to react to this situation. While your brain is processing this information and you decide to push your brake pedal and actually do so, your vehicle is still moving 30mph (44ft/s) ---------8m---------

13. Car 30mph Not Safe CRASH!! More of a fender bender but where is the fun in that?

14. A light turns yellow 15m in front of your car travelling at 40mi/hr. 1.Duration of Yellow Light Trials __ __ __ 2.Average Duration of yellow light____ 3.Length of Car ________ 4.Length of Intersection_________ 5.Distance to clear intersection _________ 6.Total stopping distance__________ 7.Time to clear intersection at 30mph__________ 8.Is the yellow light long enough? Explain. Sketch the Situation ①If you double your speed does breaking distance double? What about tripling it? ②Why is it a bad idea to tailgate the car in front of you? ③What would happen to stopping distance if the roads were wet/your tires were old/you were tired/intoxicated? ①A car traveling 40mi/hr sees a light turn yellow when 15 meters away from it. Will they have time to stop? ②You are traveling 20mi/hr in a school zone. A child runs out into the road chasing a ball 15m in front of you. Will slamming the breaks work? What if the child was only 10m away? What are appropriate following distances at these speeds? 20mph____ 30mph____ 40mph____ 50mph____ 60mph____ 70mph____