# Quick Answer: How Do You Calculate Thinking Distance?

## What is reaction distance?

Reaction distance is how far your car travels in the time it takes the driver to react to a hazard and step on the brake.

Braking distance is how far your car travels from the time the brakes are applied until it comes to a complete stop..

## How many car lengths should be between cars?

Figure one car length for every ten miles an hour,” Barndt said. “So if you’re doing 55 miles an hour you should have six car lengths between you so that if something happens to the car in front of you, you have time to stop or react.” The number two item Barndt says drivers are all guilty of is being distracted.

## How many car lengths is a safe distance?

What is a safe distance between cars? For approximately every 30kmh of speed, following distance should be two car lengths. At around 60kmh, following distance should be four car lengths.

## What factors increase braking distance?

The braking distance of a vehicle can be affected by:poor road and weather conditions, such as wet or icy roads.poor vehicle conditions, such as worn brakes or worn tyres.a greater speed.the car’s mass – more mass means a greater braking distance.

## What is work done measured in?

jouleswork done is measured in joules (J) force is measured in newtons (N) distance moved along the line of action of the force is measured in metres (m)

## How do you calculate stopping distance in mph?

In a non-metric country the stopping distance in feet given a velocity in MPH can be approximated as follows:take the first digit of the velocity, and square it. Add a zero to the result, then divide by 2.sum the previous result to the double of the velocity.

## What is the relationship between thinking distance and speed?

How far you travel whilst thinking, therefore, depends on only one thing: speed! From our work on speed, we know that distance = speed × time. Since the reaction time is essentially constant, the thinking distance is directly proportional to speed.

## What is the difference between braking distance and stopping distance?

The braking distance (BD) is the distance the car travels once the brakes are applied until it stops. The stopping distance (SD) is the thinking distance plus the braking distance, which is shown in Equation 1.

## How many car lengths is 2 seconds?

The two-second rule is useful as it works at most speeds. It is equivalent to one vehicle- length for every 5 mph of the current speed, but drivers can find it difficult to estimate the correct distance from the car in front, let alone to remember the stopping distances that are required for a given speed.

## How many feet do you stay behind a car?

Car: 243 feet (about 16 car lengths) – This gives you the necessary space to stop safely. Semi-Truck: 300 feet (about 20 car lengths) – Semis carry heavy loads, so more than slamming on the brakes, something can fall off or out of the truck, and you need time to react and avoid the debris.

## How do you calculate braking and thinking distance?

Thinking distance + Braking distance = Stopping distance Of course, some people’s reactions are better than others’, however the average distance before the driver realises there is a hazard ahead is 6 metres, when travelling at 20mph.

## What is the braking distance of a car?

The stopping distance at 20mph is around 3 car lengths. At 50mph it’s around 13 car lengths….Stopping distances at different speeds.SpeedThinking + braking distanceStopping distance30mph9m + 14m23m (75 feet)40mph12m + 24m36m (118 feet)50mph15m + 38m53m (174 feet)60mph18m + 55m73m (240 feet)2 more rows•Aug 11, 2017

## Does fog increase thinking distance?

Thinking distance is the distance covered by a vehicle whilst the driver is thinking about braking. The thinking distance depends on the reaction time of the driver. … Weather such as thick fog may increase reaction time, but usually this is not the case.

## How do you find kinetic energy from force and distance?

Kinetic Energy and WorkThe kinetic energy of an object is defined as 2 KE = 1/2 * m * v.The kinetic energy of an object depends on its velocity. … We can this combination of force and distance work, so KE(final) – KE(initial) = Work done on object.In fact, it’s a little more complicated than that.More items…

## What increases thinking distance?

The thinking distance depends on the reaction time of the driver which could be affected by drugs, alcohol, distractions and tiredness. This distance will also be affected by the car’s speed.

## How do you calculate stopping distance GCSE?

Stopping distancesIn an emergency, a driver must bring their vehicle to a stop in the shortest distance possible:stopping distance = thinking distance + braking distance.This is when:Reaction time varies from person to person, but is between typically 0.2 s and 0.9 s.More items…