TOPIC 08-WORK, ENERGY AND POWER
WORK
Work is said to be done when the applied force produces a distance.
This work is the product of force (f) and distance (d) in the direction of force.
Therefore work is given by;
W = F.d
Where F = force d = distance
SI โ UNIT OF WORK
The SI unit of work is given by;
W = F.d F = Newton d = Meter
SI- UNIT of work is Newton meter (Nm) or joule (J)
NB: 1 Joule of work is done when the force of one Newton (1N) is applied and moves a distance of one meter (1m)
Example
1. A sack of maize which weighs 800N is lifted to a height of 2m. What is the work done?
Data
F =800N
d = 2m
W =?
From
W = F.d
=800N x 2m
= 1600 Nm
= 1600 Joule