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A�Quick�Guide��
to�Inclined�Planes
What does an inclined plane do?
Inclined planes are used to lift a load through a
vertical distance. A load can be lifted vertically
upwards but this will need an effort at least
equal to the weight of the load. An inclined
plane makes the job easier.
Other simple machines such as levers and
pulleys could possibly be used to do this task.
Inclined planes simply give engineers another
tool to use, but the choice of tool to be used
depends on the job to be done.
What are inclined planes used for?
Not all inclined planes come as giant
structures. Their use can be found in many
familiar tools even though, at first sight, some
of these tools do not appear to look like an
‘inclined plane’. Examples include: loading
ramps, stairs, ladders, the cutting blades of
an axe, chisel and knife, spiral staircases,
screws, nuts and bolts, screw-threads in
water taps, bottle tops, car jacks, bench
vices, door stops, ploughs and zip fasteners.
Consider the practical problem of raising a
heavy stone block, weighing several tonnes,
to the top of a pyramid. An inclined plane
was the only practical tool that could have
been used by the ancient Egyptian engineers.
Inclined planes can also be used for
controlling the rate of descent of an object
from a height. The fastest way to descend
from one floor to another is to go straight
down using, for example, a fireman’s pole.
A slower, more controlled descent is achieved
by using an inclined plane – the stairs. The
gentler the slope, the longer the distance
to travel and the longer the time it takes to
negotiate the vertical change in height.
Education
®
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