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How is a spiral staircase an inclined plane?
Make a right angle triangle by folding and
cutting an A5 sheet of paper across the
long diagonal.
Mark the diagonal, place the marked edge
face down on the desk and roll a pencil
around the paper as shown in the diagram.
The inclined plane now forms a spiral around
the pencil shaft. The same principles apply:
the spiral or screw thread form helps you
apply the effort force over a longer distance,
so reducing the effort force needed to do
a task.
This task can be climbing a flight of stairs,
drilling a hole or inserting a screw into a piece
of wood. The longer the slope, the greater
the number of spirals, and the easier the
task becomes.
29
wheels and axles and inclined planes
website: www.knexeducation.co.uk
A Quick Guide to Inclined Planes
Not all inclined planes have straight edges. Key facts:
 • Wedgesaremovinginclinedplanes.
 •Thewedgeconceptisusedinmany
cutting tools.
 • Thegreaterthedistancemovedbythe
wedge into the object being cut, the
greater are the separating forces
produced.
 • Inclinedplanescanalsobespirals
or screws.
Education
®
30


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