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6.4 Braking and collisions
6.4 Braking and collisions
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Slide 1:
Tekstslide
Natuurkunde
Middelbare school
havo, vwo
Leerjaar 2
In deze les zitten
15 slides
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interactieve quizzen
en
tekstslides
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Lesduur is:
30 min
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6.4 Braking and collisions
Slide 1 - Tekstslide
In traffic you always have to able to stop in time without having a collision.
Slide 2 - Tekstslide
What factors will influence the braking distance?
A
Mass of the car
B
Braking force
C
Speed of the car
D
All answers above
Slide 3 - Quizvraag
The higher the initial speed,
the longer the braking distance.
Slide 4 - Tekstslide
The greater the mass of the vehicle,
the longer the breaking distance.
Slide 5 - Tekstslide
If the road is slippery you have to brake slowly, othewise the car will slip.
Slide 6 - Tekstslide
And sometimes the brakes just fail....
Slide 7 - Tekstslide
Braking distance
Depends on:
Initial speed
;
the faster you are going, the greater the braking distance
Total mass
;
the greater the mass the greater the braking distance
Braking force
;
the harder the brakes are pressed the shorter the braking distance
Slide 8 - Tekstslide
Stopping distance = reaction distance + braking distance
Slide 9 - Tekstslide
Reaction distance
Reaction distance = reaction time x velocity
The reaction time in normal conditions is around 1.0 second.
Slide 10 - Tekstslide
Braking distance
Reaction distance
Slide 11 - Sleepvraag
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.
Formulas:
stopping distance = reaction distance + braking distance
reaction distance = reaction time x velocity
Slide 12 - Tekstslide
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 13 - Open vraag
v = 39.6 km/h = 11 m/s (39.6 / 3.6)
t = 0.2 s (reaction time)
braking distance = 22.8m
stopping distance = reaction distance + braking distance
reaction distance
= v x t = 11 x 0.2 = 2.2 m
stopping distance = reaction distance + braking distance
stopping distance = 22.8 + 2.2 = 25m
Slide 14 - Tekstslide
Homework
5.4 Exercises
HAVO: 1 until 9 + 10ab + 11
VWO: 1 until 12
Slide 15 - Tekstslide
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