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Flashcards in P2 - Braking Deck (13)
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1
Q

How do brakes work in terms of physics?

A

The brakes increase the friction force meaning the backwards force is larger than the forward so the vehicle slows down

2
Q

What causes the braking distance to be larger?

A

A larger vehicle mass
A larger vehicle speed
Together this means a larger momentum because momentum = mass * velocity

3
Q

Where does the kinetic energy of the vehicle go when it brakes?

A

Heat in the brake discs

4
Q

What is the formula for kinetic energy?

A

1/2 * mass * velocity squared

5
Q

What is stopping distance?

A

How far the vehicle will travel from when the driver decides to stop to when the vehicle stops

6
Q

What are the parts of stopping distance?

A

Thinking distance

Braking distance

7
Q

What is the reaction time?

A

The time between deciding to stop and putting a foot on the brake pedal

8
Q

What is the thinking distance?

A

The distance the vehicle travels from when the driver decides to stop to when they put their foot on the brake pedal

9
Q

What are the 5 factors that affect thinking distance?

A

Tiredness
Illness
No concentration
Taking alcohol / drugs

How fast you are going (more distance covered in your reaction time)

10
Q

What is work done measured in?

A

Joules

11
Q

What is the formula for calculating work done or energy transferred?

A

Work done or energy transferred = force * distance moved in direction of the force

12
Q

What is braking distance?

A

The distance a vehicle travels after the brakes have been applied

12
Q

What are the 4 factors that affect braking distance?

A

How fast you are going

How good your brakes are

How good the tyres are

How good the grip is