Browse Definitions :
Definition

newton-second

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

As an example of impulse and its relationship with momentum, consider a rocket ship coasting through space at a speed of 10,000 (10 4 ) m/s. Suppose the ship's forward thrusters are fired for a period of 10 s, and they produce a total force of 100,000 (10 5 ) N. The impulse I generated is equal to the product of the force F and the time t :

I = Ft

= 10 5 kg · m/s 2 · x 10 s = 10 6 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. Therefore, by firing the rockets so an impulse of 10 6 kg · m/s is produced in the forward direction, the forward momentum of the vessel is increased by 10 6 kg · m/s. If the retro rockets are fired so the impulse is contrary to the direction of the ship's motion, then the forward momentum of the ship will be reduced by 10 6 kg · m/s.

The equivalence of impulse and change in momentum holds regardless of the mass of the object to which the impulse is applied.

Also see newton and Table of Physical Units .

This was last updated in March 2011
SearchCompliance
  • compliance risk

    Compliance risk is an organization's potential exposure to legal penalties, financial forfeiture and material loss, resulting ...

  • information governance

    Information governance is a holistic approach to managing corporate information by implementing processes, roles, controls and ...

  • enterprise document management (EDM)

    Enterprise document management (EDM) is a strategy for overseeing an organization's paper and electronic documents so they can be...

SearchSecurity
  • cipher block chaining (CBC)

    Cipher block chaining (CBC) is a mode of operation for a block cipher -- one in which a sequence of bits are encrypted as a ...

  • block cipher

    A block cipher is a method of encrypting data in blocks to produce ciphertext using a cryptographic key and algorithm.

  • hacker

    A hacker is an individual who uses computer, networking or other skills to overcome a technical problem.

SearchHealthIT
SearchDisasterRecovery
  • risk mitigation

    Risk mitigation is a strategy to prepare for and lessen the effects of threats faced by a business.

  • call tree

    A call tree is a layered hierarchical communication model that is used to notify specific individuals of an event and coordinate ...

  • Disaster Recovery as a Service (DRaaS)

    Disaster recovery as a service (DRaaS) is the replication and hosting of physical or virtual servers by a third party to provide ...

SearchStorage
  • cloud storage

    Cloud storage is a service model in which data is transmitted and stored on remote storage systems, where it is maintained, ...

  • cloud testing

    Cloud testing is the process of using the cloud computing resources of a third-party service provider to test software ...

  • storage virtualization

    Storage virtualization is the pooling of physical storage from multiple storage devices into what appears to be a single storage ...

Close