# Quick Answer: What Is The Minimum Stopping Distance?

## How does vehicle weight affect stopping distance?

The brake power required to stop a vehicle varies directly with its weight and the “square” of its speed.

For example, if weight is doubled, stopping power must be doubled to stop in the same distance.

If speed is doubled, stopping power must be increased four times to stop in the same distance..

## How do you find the minimum stopping distance?

Formula: Remove the zero from the speed, multiply the figure by itself and then multiply by 0.4. The figure 0.4 is taken from the fact that the braking distance from 10 km/h in dry road conditions is approximately 0.4 metres.

## What is the stopping distance at 35 mph?

136 feetAt 30mph the stopping distance is much greater—109 feet. At 35 mph it goes up to 136 feet, and you’re not really speeding yet. Switch up the numbers to freeway speeds—60 mph has a stopping distance of around 305 feet. That’s the length of an entire football field to stop.

## What are the 3 parts of total stopping distance?

Total Stopping Distance is the sum of the perception distance, reaction distance and braking distance.

## How do you calculate thinking distance?

It is important to note that the thinking distance is proportional to the starting speed. This is because the reaction time is taken as a constant, and distance = speed × time.

## What is stopping distance of vehicles?

The braking distance, also called the stopping distance, is the distance a vehicle covers from the time of the full application of its brakes until it has stopped moving. This is often given as a 100-0kph distance, e.g. 56.2m, and is measured on dry pavement. Occasionally the time taken to stop is given, too.

## How long does it take a car to stop at 60 mph?

4.5 secondsA vehicle traveling at 60 mph covers 88 feet per second. But stopping that vehicle takes over 4.5 seconds and covers a distance of 271 feet.

## What is thinking distance affected by?

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.

## Do you need to know stopping distances?

But to be a safe driver, it’s important to understand stopping distances. Whether you’re studying for your theory test or you passed years ago, it’s worth revising. Leaving enough distance between you and the car in front will: Give you a better view of the road ahead.

## How do you calculate total stopping distance?

Overall Stopping Distance: This is simply the ‘thinking distance’ added to the ‘braking distance’, so at 40mph it would be 40 + 80 = 120 feet.

## 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 stopping distance in physics?

stopping distance = thinking distance + braking distance. This is when: thinking distance is the distance a vehicle travels in the time it takes for the driver to apply the brakes after realising they need to stop. braking distance is the distance a vehicle travels in the time after the driver has applied the brake.

## How fast can a car stop going 50 mph?

Driver Care – Know Your Stopping DistanceSpeedPerception/Reaction DistanceBraking Distance40 mph59 feet80 feet50 mph73 feet125 feet60 mph88 feet180 feet70 mph103 feet245 feet2 more rows

## How do you calculate work done?

Work is done when a force that is applied to an object moves that object. The work is calculated by multiplying the force by the amount of movement of an object (W = F * d). A force of 10 newtons, that moves an object 3 meters, does 30 n-m of work.

## What is the thinking time?

This is when: thinking distance is the distance a vehicle travels in the time it takes for the driver to apply the brakes after realising they need to stop. braking distance is the distance a vehicle travels in the time after the driver has applied the brake.

## What law controls stopping distance?

Newton’s second law of motionNewton’s second law of motion explains the stopping distance of a moving object.

## How long does it take a car going 30 mph to stop?

On dry pavement that takes 4 1/2 seconds, traveling another 144 feet, but if it’s wet, you’ll travel 183 feet. You can do the math – it has taken about as long as a football field to stop your car at 55 mph (265 and 303 feet), and that is assuming you were alert. At 30 mph, it is about half a football field.

## How do you find stopping distance in physics?

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. We can now get equations for TD and BD using kinematics and Newton’s second law (ΣF = ma).

## What are the stopping distances?

Stopping distance is the total distance you travel before you apply the brakes, plus the distance you travel while the brakes slow you down. Thinking distance+ braking distance = overall stopping distance.

## When traveling at 55 mph How many feet do you need to stop?

300 feetAt 55 mph, on a dry road with good brakes, your vehicle will skid approximately 170 feet more before stopping. This distance, combined with the perception and reaction distances, means you need about 300 feet to stop a car traveling at 55 mph.

## How many feet does it take to stop at 60 mph?

Virtually all current production vehicles’ published road braking performance tests indicate stopping distances from 60 mph that are typically 120 to 140 feet, slightly less than half of the projected safety distances.

## What is the shortest stopping distance at 60 mph?

Stopping DistancesSpeedThinking Distance 2Overall Stopping Distance40 mph40 feet120 feet50 mph50 feet175 feet60 mph60 feet240 feet70 mph70 feet315 feet3 more rows•Aug 2, 2016

## What’s the stopping distance in rain?

The Overall Stopping Distances are DOUBLED (x 2) for wet roads and multiplied by TEN (x 10) for snow and icy conditions. 1m = 3.28 feet. For metres: divide measurement in feet by 3 and take the nearest answer. A reasonable rule to apply with good dry road conditions is a gap of 1 metre per mph of your speed.