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
Networking
  • network interface card (NIC)

    A network interface card (NIC) is a hardware component, typically a circuit board or chip, installed on a computer so it can ...

  • User Datagram Protocol (UDP)

    User Datagram Protocol (UDP) is a communications protocol primarily used to establish low-latency and loss-tolerating connections...

  • Telnet

    Telnet is a network protocol used to virtually access a computer and provide a two-way, collaborative and text-based ...

Security
  • advanced persistent threat (APT)

    An advanced persistent threat (APT) is a prolonged and targeted cyber attack in which an intruder gains access to a network and ...

  • Mitre ATT&CK framework

    The Mitre ATT&CK (pronounced miter attack) framework is a free, globally accessible knowledge base that describes the latest ...

  • timing attack

    A timing attack is a type of side-channel attack that exploits the amount of time a computer process runs to gain knowledge about...

CIO
HRSoftware
  • employee resource group (ERG)

    An employee resource group is a workplace club or more formally realized affinity group organized around a shared interest or ...

  • employee training and development

    Employee training and development is a set of activities and programs designed to enhance the knowledge, skills and abilities of ...

  • employee sentiment analysis

    Employee sentiment analysis is the use of natural language processing and other AI techniques to automatically analyze employee ...

Customer Experience
  • customer profiling

    Customer profiling is the detailed and systematic process of constructing a clear portrait of a company's ideal customer by ...

  • customer insight (consumer insight)

    Customer insight, also known as consumer insight, is the understanding and interpretation of customer data, behaviors and ...

  • buyer persona

    A buyer persona is a composite representation of a specific type of customer in a market segment.

Close