# 6.4 Braking and collisions

6.4 Braking and collisions
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Slide 1: Tekstslide
NatuurkundeMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 15 slides, met interactieve quizzen en tekstslides.

Lesduur is: 30 min

## Onderdelen in deze les

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

#### 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