6.4 Braking and collisions

6.4 Braking and collisions
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6.4 Braking and collisions

Slide 1 - Diapositive

In traffic you always have to able to stop in time without having a collision.

Slide 2 - Diapositive

If you drive to fast, you might miss a curve.
If the initial speed is high, de braking distance is long. 

Slide 3 - Diapositive

The greater the mass of the vehicle, the longer the breaking distance.

Slide 4 - Diapositive

If the road is slippery you have to brake slowly.
If your braking force is to high the car skids.

Slide 5 - Diapositive

And sometimes the brakes just fail....

Slide 6 - Diapositive

initial speed and braking distance
If the speed is n times greater, 
the breaking distance becomes n2 times longer.
v = 10 m/s
s = 5 m
v = 20 m/s
s = 20 m
v = 30 m/s
s = 45 m
n= 2= 4
n2 = 32 = 9

Slide 7 - Diapositive

What's the STOPPING distance?
stopping distance = reaction distance + braking distance

Slide 8 - Diapositive

A horse runs to the finishline at 39.6 km/h. The drivers reaction time is 0.2 s. The braking distance is 22.8 m. Determine the stopping distance.

Slide 9 - Diapositive

A horse runs to the finishline at 39.6 km/h. The drivers reaction time is 0.2 s. The braking distance is 22.8 m. Determine the stopping distance.

Slide 10 - Question ouverte

given: v = 39.6 km/h = 11 m/s (39.6 / 3.6)
            t = 0.2 s
           s1 = 22.8m
asked: stopping distance
Solution : reaction distance : 
                   s2 = v x t = 11 x 0.2 = 2.2 m
           Stopping distance : s1 + s2 = 22.8 + 2.2 = 25m

Slide 11 - Diapositive

A horse runs to the finishline at 39.6 km/h. The drivers reaction time is 0.2 s. The braking distance is 22.8 m. Determine the stopping distance.

given: v = 39.6 km/h = 11 m/s (39.6 / 3.6)
t = 0.2 s
s1 = 22.8m
asked: stopping distance
Solution : reaction distance :
s2 = v x t = 11 x 0.2 = 2.2 m
Stopping distance : s1 + s2 = 22.8 + 2.2 = 25m

Slide 12 - Question ouverte

Work
Sum 6.4
do 38, 40, 41, 42, 44

Slide 13 - Diapositive