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### Transcript of "Physics presentation road"

1. 1. By Unit Physics ‘ Jalan-jalan cari Jalan’
2. 2. ‘ Jalan-jalan cari Jalan’ Road Hazard Case study : Based on our research and survey, Jalan Gambang ( in front of Sen Peng Sawmill) was the most hazardous road in Gambang. Our purpose of this project is to propose the solution of these road hazardous to Majlis Perbandaran Kuantan and Roadcare.
3. 3. Photo by Azli Ariff Road Hazard ‘ Jalan-jalan cari Jalan’
4. 4. <ul><li>The factors contribute to road hazard: </li></ul><ul><li>lorries traffic from /to sawmill. </li></ul><ul><li>The road frequently use by heavy transport- truck and treller </li></ul><ul><li>lot of lorries park on the roadside and block the driver view </li></ul><ul><li>there are no road signs ( speed limit, warning sign ) </li></ul><ul><li>Wavy road </li></ul><ul><li>‘ Sharp road curve’ 100 metres before the sawmill </li></ul>Newton’s Laws allow us to describe the location, direction, and time of many everyday events. They help make the world understandable.
5. 5. Determined primarily by work of the brakes, velocity of the car, and road conditions where  is the coefficient of friction m is the mass of the car g is the acceleration of gravity d is the distance needed to brake v o is the initial car velocity
6. 6. This simplifies to: <ul><li>is usually measured to be 0.8 on dry roads, but drops if the road is wet </li></ul><ul><li>Since v o is squared, doubling the speed, quadruples the braking distance </li></ul>
7. 8. <ul><li>As shown by the previous graph, the intersection may be made safer at very little cost if the driver reaction time is increased and stopping time is decreased. This would be achieved by the following: </li></ul><ul><ul><li>Trees next to road should be trimmed to allow better visibility. </li></ul></ul><ul><ul><li>Speed limit on road should be 30 km/h near this intersection of lorries enter/exit from sawmill. </li></ul></ul><ul><ul><li>Put the warning sign before intersection. </li></ul></ul><ul><ul><li>Widen the road pavement. </li></ul></ul>Proposal to reduce road hazardous
8. 9. Nave, R. &quot;Stopping Distance for Auto.&quot; Hyperphysics . 2005. < http://hyperphysics.phy-astr.gsu.edu/hbase/crstp.html >. &quot;Stopping Distance.&quot; Safe Drive Training . 2004.< http:// www.sdt.com.au/STOPPINGDISTANCE.htm >. Memmer, S and J. Helperin. &quot;Keep Your (Braking) Distance: More Than Just Slowing Down.&quot; 2000. < http://applications.edmunds.com/ownership/driving/articles/43810/article.html >. Clip Art from Microsoft Office
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