:DONE BY

Sharifa Hamad ALnuaimi

Rahma salem ALreyami

Amna Saif ALkabi

Amna younis

Task 2

Task 2

Suppose a car left a skid mark of d feet long. The above formulas will estimate the speed s in miles per hour at which the car was traveling when the brakes were applied.

1. Complete the table

2. Why do you think the estimates of speed do not double when the skid marks double in length?

- Because a car on a wet road will slide further than a car on a dry road.

- Because of the use of friction brakes and wheels on the street.

- Because the speed is directly proportional to the distance.

3. Based on these results, what conclusions can you make about a safe following distance?

- Driving on the appropriate speed and distance to stop and not be surprised, That will avoid accidents.

- when the car is driven on a wet road and not on a dry road it double the speed and you will not stop at the same time u try to stop the car. However, it takes more time to stop on both dry and wet roads, That’s why many people cause accidents, especially when the drive with a high speed or accelerate

Task 3

The formula d = 0.044s2 + 1.1s relates the maximum speed s in mph that you should travel in order to be able to stop in d feet.

Suppose you have 150 feet (about 10 car lengths) between your car and the car in front of you. Find the maximum speed you should travel to avoid a collision.

d = 044s2+1.1s
150 = 0.044s2 + 1.1s
0.044s2 +1.1s – 150 = 0

Solve by this way: S = -b ± √ b2 – 4ac

Or by finding delta d

S1= 47.2         S2=-72.2

We will take the positive number which is equal to 47.2 .. the negative number is rejected.

TASK 1

        

    1 TASK 

                                                        

10	15.4
20	39.6
30	72.6
40	114.4
50	165
60	224.4

Road Rage and Accident Probability

Road Rage and Accident Probability

what is "Road Rage
?

"Road Rage" is a term that is believed to have originated in the United States. In its broadest sense it can refer to any display of aggression by a driver. However, the term is often used to refer to the more extreme acts of aggression, such as a physical assault, that occur as a direct result of a disagreement between drivers.

The response to a stressful situation may often be anger. When we are confronted by a frustrating situation we often resort to aggression. This is often no more than verbal abuse. However, there are circumstances in which we may resort to physical violence. In the late 1980s, drivers in the United States, apparently frustrated by increasing congestion, began fighting and shooting each other on a regular basis, victims of what the popular press termed "road rage." There is nothing to suggest that road rage is distinct from any other form of anger. But for many of us driving has become one of the most frustrating activities we are regularly engaged in. In the United States, unverified figures of up to 1,200 road rage-related deaths a year have been reported. There is very little data available on the extent of the problem in the United Kingdom, although there have been increasing numbers of reports of violent disagreements between motorists over the last year.

?What Causes "Road Rage"

.It is likely that the cause of the road rage extends beyond the immediate incident

.Human beings are territorial. As individuals we have a personal space, or territory

The car is an extension of this territory. Indeed, the territory extends for some distance beyond the vehicle.

the defending driver may wish to go one step further and assert his dominance.

?How to Avoid Succumbing to Road Rage

ever assume that an apparently aggressive act was intended as such. We all make mistakes. So don't bite back. If we take an example from studies of animal behavior in the wild, the dominant animal in a group will rarely get involved in petty fights and disagreements. Although confident in his ability to defeat any opponent, there is always the risk of injury.

Finally, draw reassurance from the fact that if you feel that someone is driving like an idiot, everyone else does also.

Road rage and accident probability

Calculating Your Braking Distance

Calculating Your Braking Distance

Braking Distance: "Braking distance" is the distance your car  travels after the car brakes have been applied. According to auto industry standards for deceleration

Stopping Distance: The term "stopping distance" takes into account the distance you travel before you hit the car brake system (reaction distance) plus the distance you travel while the brakes slow you down (braking distance).

Reaction Distance: If it takes you 1.5 seconds to realize that a problem exists, you've already passed 150 feet.

Variables: Braking distance varies depending on many variables, including your reaction time, the speed at which you are traveling, the weight of the car, road conditions, braking efficiency, and friction between the surface of the road and your tires. You can see that there are many things that can go wrong when you need to brake in a hurry.

, you may want to test your brake road safety. There are two times when you should be interested in calculating your braking distance.

Driver Reaction Time

Driver Reaction Time

Twelve subjects drove on a closed 5-km track until they fell asleep behind the wheel or quitted for other reasons. The instances of falling asleep occurred after 7 to 12 hours of driving. Falling asleep could be characterized by nodding of the head, closing of the eyes and the car continuing in its previous

s course. On none of these occasions did the experimenter have to take over the control of the car and all subjects woke by themselves. The average duration between three instances of falling asleep was 24 min. After a break with a brisk walk the subjects fell asleep again after an average of 23 min. Two preceding sessions of 3 hours of driving on a motorway with subsidiary reaction time measurements predicted (r= — 0·72 and —0·17) the endurance on the closed track.

?how can we graph thr quadratic equation

?how can we graph the quadratic equation

when we want to graph a quadratic equation , we have to find A,B,and C ,we can found it from the

equation. the number that in front of x to the power 2 represent A, and the number in front of  x , represent B and the number with out variable represent C ,then we found the line of symmetry using the law -B divided by 2 times A ,after that we make a ashed line on the x-y graph .after that we have to make the table , you will found that each two value is equal . then sketch the point after that draw it on the graph