Browse Definitions:
Definition

kilogram-meter per second

The kilogram-meter per second (kg · m/s or kg · m · s -1 ) is the standard unit of momentum . Reduced to base units in the International System of Units ( SI ), a kilogram-meter per second is the equivalent of a newton-second (N · s), which is the SI unit of impulse . Although the units are the same in base terms, there is a conceptual difference between momentum and impulse.

As an example of momentum, consider a rocket ship coasting through space at a speed v of 10,000 (10 4 ) m/s. Suppose the mass of the ship, m , is equal to 10,000 (10 4 ) kg. The forward momentum, p , is equal to the product of the mass and the forward speed:

p = mv

= 10 4 kg x 10 4 m/s = 10 8 kg · m/s

A rule of Newtonian physics states that the impulse imparted to an object is equal to the change in momentum for that object, provided no other forces or effects are involved. Consider the problem of calculating how long to fire the above mentioned space ship's retro rockets to bring it to a halt with respect to an observer who sees its initial momentum as 10 8 kg · m/s. This requires an impulse in the reverse direction of 10 8 N · s. Suppose the ship's retro rockets produce 100,000 (10 5 ) N of force. According to the formula for impulse, where F is the force in newtons and t is the time in seconds for which the force is applied:

I = Ft and therefore t = I / F

t = (10 8 N · s) / (10 5 N)

= 1000 s

This is equal to 16 minutes and 40 seconds.

Also see the Table of Physical Units .

This was last updated in September 2005

Join the conversation

2 comments

Send me notifications when other members comment.

By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

Please create a username to comment.

The newton is not an SI base unit.
Cancel
It doesn't say that. It said kilogram-meter per second is reduced to base units (which it is), and is equivalent to N s, which it refers to as an SI unit, not base unit.
Cancel

-ADS BY GOOGLE

File Extensions and File Formats

Powered by:

SearchCompliance

  • smart contract

    A smart contract, also known as a cryptocontract, is a computer program that directly controls the transfer of digital currencies...

  • risk map (risk heat map)

    A risk map, also known as a risk heat map, is a data visualization tool for communicating specific risks an organization faces. A...

  • internal audit (IA)

    An internal audit (IA) is an organizational initiative to monitor and analyze its own business operations in order to determine ...

SearchSecurity

  • evil maid attack

    An evil maid attack is a security exploit that targets a computing device that has been shut down and left unattended.  An evil ...

  • Common Body of Knowledge (CBK)

    In security, Common Body of Knowledge (CBK) is a comprehensive framework of all the relevant subjects a security professional ...

  • rootkit

    A rootkit is a program or, more often, a collection of software tools that gives a threat actor remote access to and control over...

SearchHealthIT

  • value-based healthcare

    Value-based healthcare, also known as value-based care, is a payment model that rewards healthcare providers for providing ...

  • health informatics

    Health informatics is the practice of acquiring, studying and managing health data and applying medical concepts in conjunction ...

  • clinical trial

    A clinical trial, also known as a clinical research study, is a protocol to evaluate the effects and efficacy of experimental ...

SearchDisasterRecovery

  • crisis communication

    Crisis communication is a method of corresponding with people and organizations during a disruptive event to provide them with ...

  • Zerto

    Zerto is a storage software vendor that specializes in enterprise-class business continuity and disaster recovery in virtual and ...

  • crisis management plan (CMP)

    A crisis management plan (CMP) is a document that outlines the processes an organization will use to respond to a critical ...

SearchStorage

  • SSD write cycle

    An SSD write cycle is the process of programming data to a NAND flash memory chip in a solid-state storage device.

  • data storage

    Data storage is the collective methods and technologies that capture and retain digital information on electromagnetic, optical ...

  • hard disk

    A hard disk is part of a unit -- often called a disk drive, hard drive or hard disk drive -- that stores and provides relatively ...

SearchSolidStateStorage

  • hybrid hard disk drive (HDD)

    A hybrid hard disk drive is an electromechanical spinning hard disk that contains some amount of NAND Flash memory.

Close