Work, Energy and Power (2)

Science

Not quite remember

I easily remember

Definition of displacement

Is the distance travelled in a specified direction

Physical quantities other than work which are measured in units of newton metre (1)

Moment of force

Physical quantities other than work which are measured in units of newton metre (2)

Energy

Larger units used in the measurement of work (1)

kilojoule (kJ)

Larger units used in the measurement of work (2)

megajoule (MJ)

The formula for calculating power, P

Power, P = Work done, W / Time taken, t

Energy

When a force of 1 N is used to move an object over a distance of 1 m in the direction of the force, 1 J of energy is used

The formula for calculating work, W

Work, W = Force, F X displacement, s

Power, P

When 1 joule (J) of work is done in 1 second (s), power of 1 watt (W) is used, that is 1 W = 1 J s–1

A unit usually used for power in the olden days

Is horsepower (hp)

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