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Kilometres per hour (km/h) to Feet per second (ft/s) conversion

Kilometres per hour to Feet per second conversion table

Kilometres per hour (km/h)Feet per second (ft/s)
00
10.9113446583067
21.8226893166133
32.73403397492
43.6453786332267
54.5567232915333
65.46806794984
76.3794126081467
87.2907572664533
98.20210192476
109.1134465830667
2018.226893166133
3027.3403397492
4036.453786332267
5045.567232915333
6054.6806794984
7063.794126081467
8072.907572664533
9082.0210192476
10091.134465830667
1000911.34465830667

How to convert kilometres per hour to feet per second?

Kilometres per hour (km/h) and feet per second (ft/s) are both units used to measure speed. Understanding how to convert between them is essential in various fields, including physics, engineering, and even everyday life when comparing speeds.

Conversion Fundamentals

Converting between km/h and ft/s involves understanding the relationship between kilometers and feet, as well as hours and seconds.

  • 1 kilometer (km) = 3280.84 feet (ft)
  • 1 hour (h) = 3600 seconds (s)

Converting Kilometres per Hour to Feet per Second

To convert from km/h to ft/s, you need to convert kilometers to feet and hours to seconds. Here’s the step-by-step process:

  1. Start with the given speed: 1 km/h
  2. Convert kilometers to feet: Multiply by the conversion factor 3280.84 ft1 km\frac{3280.84 \text{ ft}}{1 \text{ km}}
  3. Convert hours to seconds: Divide by the conversion factor 3600 s1 h\frac{3600 \text{ s}}{1 \text{ h}}

Therefore, the conversion can be expressed as:

1kmh×3280.84 ft1 km×1 h3600 s=0.91134fts1 \frac{\text{km}}{\text{h}} \times \frac{3280.84 \text{ ft}}{1 \text{ km}} \times \frac{1 \text{ h}}{3600 \text{ s}} = 0.91134 \frac{\text{ft}}{\text{s}}

So, 1 kilometre per hour is approximately equal to 0.91134 feet per second.

Converting Feet per Second to Kilometres per Hour

To convert from ft/s to km/h, you’ll reverse the process.

  1. Start with the given speed: 1 ft/s
  2. Convert feet to kilometers: Multiply by the conversion factor 1 km3280.84 ft\frac{1 \text{ km}}{3280.84 \text{ ft}}
  3. Convert seconds to hours: Multiply by the conversion factor 3600 s1 h\frac{3600 \text{ s}}{1 \text{ h}}

Therefore, the conversion can be expressed as:

1fts×1 km3280.84 ft×3600 s1 h=1.09728kmh1 \frac{\text{ft}}{\text{s}} \times \frac{1 \text{ km}}{3280.84 \text{ ft}} \times \frac{3600 \text{ s}}{1 \text{ h}} = 1.09728 \frac{\text{km}}{\text{h}}

So, 1 foot per second is approximately equal to 1.09728 kilometres per hour.

Interesting Facts and Historical Context

While there isn't a specific law or person directly associated with the km/h to ft/s conversion, the general principles of unit conversion are fundamental to physics and engineering. Dimensional analysis, a technique used to ensure equations are dimensionally consistent, relies heavily on accurate unit conversions.

Galileo Galilei (1564-1642) is one notable figure who laid the groundwork for understanding motion and speed. Although he didn't use modern units like km/h or ft/s, his experiments with falling objects and his development of concepts like uniform acceleration were crucial in the development of kinematics.

Real-World Examples

Here are examples of when you might need to convert km/h to ft/s or vice versa:

  • Sports: In some sports analyses, speeds might be given in different units. For example, a soccer player's sprint speed could be measured in km/h in Europe and might need to be converted to ft/s for an American audience.
  • Engineering: When designing transportation systems, engineers might need to convert speeds from one unit to another to ensure compatibility with existing infrastructure or regulations.
  • Accident Reconstruction: Accident investigators may need to convert speeds from skid marks (measured in feet) to km/h to determine the speed of a vehicle before an accident.
  • Weather Reporting: While wind speed is often given in miles per hour (mph) or km/h, converting to ft/s can be useful for detailed analysis of wind gusts and their impact on structures.

See below section for step by step unit conversion with formulas and explanations. Please refer to the table below for a list of all the Feet per second to other unit conversions.

What is Kilometres per hour?

Kilometres per hour (km/h) is a unit of speed, expressing the number of kilometres travelled in one hour. It is a commonly used unit for measuring the speed of vehicles and wind speeds.

Definition and Formation

Kilometres per hour is a derived unit, formed by combining the units of distance (kilometres) and time (hours).

  • Kilometre (km): A unit of length in the metric system, equal to 1000 meters.
  • Hour (h): A unit of time, equal to 60 minutes or 3600 seconds.

Therefore, 1 km/h means travelling a distance of 1 kilometre in a time of 1 hour.

Conversion to Other Units

Kilometres per hour can be converted to other commonly used units of speed:

  • Meters per second (m/s): To convert from km/h to m/s, divide by 3.6.

    m/s=km/h3.6\text{m/s} = \frac{\text{km/h}}{3.6}

  • Miles per hour (mph): To convert from km/h to mph, divide by 1.60934.

    mph=km/h1.60934\text{mph} = \frac{\text{km/h}}{1.60934}

Significance and Applications

  • Speedometers: Most cars, motorcycles, and other vehicles display speed in km/h in countries that use the metric system.
  • Weather Reports: Wind speeds are often reported in km/h, especially in regions adhering to metric standards.
  • Sports: The speed of a runner or cyclist might be measured in km/h during a race.

Interesting Facts and Associations

While no specific scientific "law" is directly tied to km/h, understanding speed and its measurement has been crucial to many scientific advancements. One notable association involves the development of radar technology.

  • Radar Speed Guns: Radar technology, initially developed for military applications, is now commonly used by law enforcement to measure the speed of vehicles in km/h (or mph in some regions). These devices utilize the Doppler effect to determine the speed of a moving object. Learn more about Radar Speed Guns.

Real-World Examples

Here are some examples illustrating different speeds in km/h:

  • Walking Speed: A brisk walking speed is typically around 5 km/h.
  • City Driving: Speed limits in urban areas often range from 30-50 km/h.
  • Highway Driving: Highway speed limits can range from 80-130 km/h, depending on the country.
  • High-Speed Train: Some high-speed trains can travel at speeds exceeding 300 km/h.
  • Commercial Airliner: Cruising speeds for commercial airplanes are around 800-900 km/h.

Understanding km/h provides a practical way to gauge the rate at which objects are moving, contributing to safety and awareness in various everyday situations.

What is Feet per Second?

Feet per second (fps) is a unit of speed expressing the distance in feet traveled per second. It's commonly used in various fields, including sports, engineering, and meteorology, to quantify how fast an object is moving.

Formation of Feet per Second

Feet per second is derived from two fundamental units:

  • Feet (ft): A unit of length in the imperial and US customary systems.
  • Second (s): The base unit of time in the International System of Units (SI).

The unit is formed by dividing a distance measured in feet by a time measured in seconds:

Speed=Distance (ft)Time (s)\text{Speed} = \frac{\text{Distance (ft)}}{\text{Time (s)}}

Real-World Examples and Applications

  • Sports: A baseball pitch can reach speeds of 90-100 mph, which is approximately 132-147 fps.
  • Meteorology: Wind speed is often measured in feet per second, especially in aviation and weather forecasting. For example, a moderate breeze might be around 15-20 fps.
  • Engineering: Calculating the speed of a vehicle or fluid flow in a pipe. For instance, water flowing through a pipe at 10 fps.
  • Ballistics: Measuring the muzzle velocity of a bullet, which can range from 800 fps to over 3000 fps depending on the firearm and ammunition.

Relationship to Other Speed Units

Feet per second can be converted to other common units of speed using the following relationships:

  • Miles per hour (mph): 1 fps ≈ 0.681818 mph
  • Meters per second (m/s): 1 fps ≈ 0.3048 m/s
  • Kilometers per hour (km/h): 1 fps ≈ 1.09728 km/h

Notable Associations and Facts

While there isn't a specific law or person directly associated with the invention or formalization of feet per second, its usage is deeply ingrained in fields that involve motion and speed measurements.

  • Galileo Galilei: His work on motion and free fall laid the groundwork for understanding speed and acceleration, though he didn't use the modern unit of feet per second.
  • Speed of Sound: At sea level and 20°C, the speed of sound is approximately 1125 fps. This is a critical value in acoustics and aerodynamics. Read more about speed of sound from NASA Glenn Research Center.

Quick Conversions

Here are some common speeds converted to feet per second:

  • 30 mph ≈ 44 fps
  • 60 mph ≈ 88 fps
  • 100 mph ≈ 146.67 fps

Complete Kilometres per hour conversion table

Enter # of Kilometres per hour
Convert 1 km/h to other unitsResult
Kilometres per hour to Metres per second (km/h to m/s)0.2777777777778
Kilometres per hour to Millimeters per hour (km/h to mm/h)1000000
Kilometres per hour to Miles per hour (km/h to mph)0.6213711922373
Kilometres per hour to Knots (km/h to knot)0.5399570136728
Kilometres per hour to Feet per second (km/h to ft/s)0.9113446583067
Kilometres per hour to Feet per minute (km/h to ft/min)54.680839895573
Kilometres per hour to Inches per hour (km/h to in/h)39377.135122771

Speed conversions