**Table of Contents**

1. | Introduction |

2. | Definitions |

3. | Unit Conversion for Time |

4. | Unit Conversion for Speed/Velocity |

5. | Unit Conversion for Acceleration |

6. | Examples |

7. | Summary |

8. | FAQs |

**Introduction**

In this article, we will learn about a few important attributes, their units, and conversion methods between the different units.

- Speed
- Velocity
- Acceleration
- Time

**Speed, Acceleration, and Time Unit Conversions-PDF**

**Learn about the Conversion of Units of Speed, Acceleration, and Time. m/s to km/h, km/h to mi/h, m/s2 to km/s2, hr to seconds, etc. with examples. Here is a downloadable PDF to explore more.**

ðŸ“¥ | Speed, Acceleration, and Time Unit Conversions-PDF |

**Read Also,**

- Weight, Mass, and Density Conversion

**Definition**

**Speed**

Speed is defined as the rate at which an object is moving (covering a particular distance). It is a ** scalar** quantity as it defines only the

**and not direction.**

*magnitude*The SI derived unit for speed is meter per second (**m/s).**

**Velocity**

Velocity is defined as the rate of change of an object’s position with respect to a frame of reference.

Velocity is a ** vector** quantity as it describes both the

**and**

*magnitude***.**

*direction*The SI derived unit for velocity is **meter per second** (**m/s).**

**Acceleration**

Acceleration is also a ** vector** quantity and is defined as the rate of change of velocity with change in time.

The SI derived unit for acceleration is **meter per second squared** (**m/s ^{2}).**

**Time**

A measurable period during which an action/event happens is Time.

The SI derived unit for Time is **seconds (s).**

**International System of Units (SI)**

International system of units is the modern form of the Metric system. The units listed in this system are used as the standard units of measurements in almost every country in the world.

**Unit conversions for Time**

In this section we will look at different units used to measure Time and the conversion formulae needed to convert a value from one unit to another.

**Unit Converter**

**Hour To Second (hr to s)**

**Minutes To Hour (min to hr)**

**Minutes To Day (min to days)**

**Days To Minute (days to min)**

**Hours To Days (hrs to days)**

**Seconds To Week **

**Unit conversions for Speed/Velocity**

In this section, we will see various formulae for the conversion of values between different unit representations for speed/Velocity.

In general, the method used to arrive at the formula is based on the individual units in the numerator and the denominator.

**Unit Converter**

**Meter/Second To kilometer/Hour (m/s to km/h)**

**Kilometer/Hour To Meter/Second (km/h to m/s)**

**Kilometer/Second To Miles/Hour (km/s to mi/h)**

**Feet/Second To Meter/Second (ft/s to m/s)**

**Miles/Hour To Meter/Second (mi/h to m/s)**

**Meter/Second To Feet/Second (m/s to ft/s)**

**Kilometer/Second To Meter/Second (km/s to m/s)**

**Centimeter/Second To Meter/Second (cm/s to m/s)**

**Feet/Minute To Meter/Second (ft/min to m/s)**

**Miles/Hour To Feet/Second (mi/h to ft/s)**

**Rotations/Minute To Meter/Second **

where 2 × π × r = Linear Velocity

**Radians/Second To Meter/Second (rad/s to m/s)**

**Meter/Second To Mach (m/s to Mach)**

Mach is the ratio of the speed of a moving object through a fluid to the speed of sound in the same medium. Since it is a ratio, it does not have any dimension.

The speed of the sound is not constant. It varies depending on the temperature and the atmospheric pressure.

**Unit conversions for Acceleration**

In this section, we will see various formulae for the conversion between different unit representations for acceleration.

In general, the method used to arrive at the formula is based on the individual units in the numerator and the denominator.

**Unit Converter**

**Feet/Second**^{2} To Meter/Second^{2} (ft/s^{2 }to m/s^{2})

^{2}To Meter/Second

^{2}(ft/s

^{2 }to m/s

^{2})

**Meter/Second**^{2} To Kilometer/Second^{2} (m/s^{2 }to km/s^{2})

^{2}To Kilometer/Second

^{2}(m/s

^{2 }to km/s

^{2})

**Meter/Second**^{2} To Kilometer/Hour^{2 }(m/s^{2} to km/h^{2})

^{2}To Kilometer/Hour

^{2 }(m/s

^{2}to km/h

^{2})

**Feet/Second**^{2} To Kilometer/Second^{2 }(ft/s^{2} to km/s^{2})

^{2}To Kilometer/Second

^{2 }(ft/s

^{2}to km/s

^{2})

**Kilometer/Second**^{2} To Feet/Second^{2 }(km/s^{2} to ft/s^{2})

^{2}To Feet/Second

^{2 }(km/s

^{2}to ft/s

^{2})

**Kilometer/hour**^{2} To Meter/Second^{2} (km/h^{2 }to m/s^{2})

^{2}To Meter/Second

^{2}(km/h

^{2 }to m/s

^{2})

**Meter/Second**^{2} To Feet/Second^{2 }(m/s^{2 }to ft/s^{2})

^{2}To Feet/Second

^{2 }(m/s

^{2 }to ft/s

^{2})

**Miles/Second**^{2} To Kilometer/Hour^{2 }(mi/s^{2 }to km/h^{2})

^{2}To Kilometer/Hour

^{2 }(mi/s

^{2 }to km/h

^{2})

**Kilometer/Hour**^{2} To Miles/Hour^{2 }(km/h^{2 }to mi/h^{2})

^{2}To Miles/Hour

^{2 }(km/h

^{2 }to mi/h

^{2})

**Gal To kilometer/hour**^{2} (1 gal to km/h^{2})

^{2}(1 gal to km/h

^{2})

1 Gal = 1 centimeter/second^{2}

^{}

**Examples**

In this section we are going to see some examples for unit conversions.

Example 1 |

**Convert a speed of 90 meters per second to kilometer per hour **

To convert a value from m/s to km/hr, we need to multiply it by 3.6

So, 90 m/s = 90 × 3.6 = 324 km/hr

Example 2 |

**Convert a speed of 10 feet per second to meters per second **

To convert a value from ft/s to m/s, we need to multiply it by 0.3048

So, 10 ft/s = 10 × 0.3048 = 3.048 m/s

Example 3 |

**Convert a velocity of 25 mph to feet per second **

To convert a value from miles/hr to feet/sec, we need to multiply it by 1.47

So, 25 mph = 25 × 1.47 = 36.7 ft/s

Example 4 |

**Convert an acceleration of 120 metre per second squared to kilometre per hour squared **

To convert a value from meter/sec^{2} to kilometre/ hr^{2}, we need to multiply it by 12960

So, 120 m/s^{2} = 120 × 12960 = 15,55,200 km/hr^{2}

Example 5 |

**Convert 58 Gal into kilometer per hour squared **

To convert a value from Gal to kilometre/ hr^{2}, we need to multiply it by 129.6

So, 58 Gal = 58 × 129.6 = 7516.8 km/hr^{2}

Example 6 |

**How many minutes are there in 4 days?**

Hours in a day = 24

Hours in 4 days = 24 × 4 = 96

Minutes in 1 hour = 60

So, minutes in 96 hours = 96 × 60 = 5760

Example 7 |

**How many seconds are there in one week?**

Number of days in 1 week = 7

Number of hours in a day = 24

Number of minutes in 1 hour = 60

Number of seconds in 1 minute = 60

So, number of seconds in 1 week = 60 × 60 × 24 × 7 = 604800

**Summary**

In this article, we learnt about Time, Speed, Velocity and Acceleration. We learnt their definitions, units and the conversion rules/formulae between different units.

This may serve as a quick reference guide for any of the concepts mentioned above.

*Written by Gayathri Sivasubramanian, Cuemath Teacher*

**Frequently Asked Questions (FAQs)**

## How many weeks are in 6 months?

Number of days in a year (12 months) = 365 (366 once every 4 years)

Number of days in a year (6 months) = 365/2 = 182.5

Number of days in a week = 7

So, the number of weeks in 6 months = 182.5/7 = 26.07 (approximately 26 weeks)

## What is the difference between Speed and Velocity?

Both speed and velocity are the ratio of the distance moved by an object to the time taken for the movement.

But Speed is a ** Scalar** quantity. It considers only magnitude irrespective of the direction.

Whereas velocity is a ** Vector** quantity and it represents both magnitude and direction.

## What is the relation between speed and acceleration?

Acceleration is the rate of change of speed. It denotes the change of speed with respect to time.

## How many seconds in an hour?

Number of seconds in a minute = 60

Number of minutes in an hour = 60

So, number of seconds in an hour = 60 × 60 = 3600

## How many minutes in a day?

Number of minutes in an hour = 60

Number of hours in a day = 24

So, number of minutes in a day = 60 × 24 = 1440