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Lesson�7:�The�Hand�Drill
 • Askwhytheythinkfiremenslidedownapoleto
reach their fire engines in emergencies and not a spiral
staircase or spiral slide?
Teacher’s Notes
Going vertically down the pole is the
fastest route. A spiral staircase would
take too long because it is a longer
distance than the vertical slide down
the pole.
Explain to the class that using a spiral
allows a gentler descent and an easier
way to go up when compared to
going straight up or down. The verti-
cal distance they travel is the same in
both cases; the only difference is the
route they take.
Remind the children that they explored
this concept when they investigated
the ramp. They discovered it requires
less effort to go up a gentle slope
than a very steep one although, to
reach the same height, the gentler
slope will involve travelling over a
longer distance.
Let’s Investigate – Changing a slope into a spiral.
Working in pairs (or whole class demonstration)
Each pair will need an A5 sheet of
paper, felt-tipped pen, ruler, scissors,
pencil or thin dowelling.
 • Askthechildrentocompletethefollowing:
1. Fold an A5 sheet of paper across a long diagonal from
corner to corner; then cut the paper along the fold line
to make 2 right angle triangles.
2. Use a felt-tipped pen to draw a thick line along the long
diagonal edge they have just cut.
Education
®
41


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