6.4 Braking and collisions

6.4 Braking and collisions
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NatuurkundeMiddelbare schoolhavo, vwoLeerjaar 2

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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

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 - Quiz

The higher the initial speed,
the longer the braking distance.

Slide 4 - Diapositive

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

Slide 5 - Diapositive

If the road is slippery you have to brake slowly, othewise the car will slip.

Slide 6 - Diapositive

And sometimes the brakes just fail....

Slide 7 - Diapositive

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 - Diapositive

Stopping distance = reaction distance + braking distance

Slide 9 - Diapositive

Reaction distance

Reaction distance  =  reaction time  x  velocity

The reaction time in normal conditions is around 1.0 second.

Slide 10 - Diapositive

Braking distance
Reaction distance

Slide 11 - Question de remorquage

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 - 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 13 - Question ouverte

  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 - Diapositive

Homework
5.4 Exercises
HAVO: 1 until 9 + 10ab + 11
VWO: 1 until 12

Slide 15 - Diapositive