4 Energy – Part A “Units”

Syllabus Aims…

4.1 use the following units: kilogram (kg), joule (J), metre (m), metre/second (m/s), metre/second2 (m/s2), newton (N), second (s), watt (W).



Kilogram (kg): the SI unit of mass, equivalent to the international standard kept at Sèvres near Paris (approximately 2.205 lb).

Joule (J): the SI unit of work or energy, equal to the work done by a force of one newton when its point of application moves one metre in the direction of action of the force.

Speed: the rate at which someone or something moves or operates or is able to move or operate.

Acceleration (m/s/s OR Nkg-1 OR ms-2) vehicle’s capacity to gain speed.

Metre (m): the fundamental unit of length in the metric system, equal to 100 centimetres or approximately 39.37 inches.

Newton (N): the SI unit of force. It is equal to the force that would give a mass of one kilogram an acceleration of one metre per second per second.

Watt (W): the SI unit of power, equivalent to one joule per second, corresponding to the rate of consumption of energy in an electric circuit where the potential difference is one volt and the current one ampere.


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