Attach a small weight to the end of your string.Pre-cut templates or photocopy irregular shape templates onto cardstock. What does it mean to say that something is “balanced”? Is the centre of gravity exactly in the middle (geometric centre) of the shape? How can you check that you have correctly found your shape’s centre of gravity? What does the spot where your lines intersect represent? Why do we have to draw several lines from different points? Use the force of gravity to deduce the centre of gravity for various shapes.Ĥ cardstock shapes, either pre-cut or printed for students to cut out (see shape card templates)Ī chalk or pen (colour should contrast the shapes’ colour)Ī small weight to hang from the string (e.g. If it were leaning more, it would topple over since the plumb line would fall outside the base.Įxamine the concept of the centre of gravity. This is why the Leaning Tower of Pisa does not topple over: its centre of gravity is still above its base when a plumb line is drawn. If the plumb line falls outside of the base of support, the object will topple over. To answer a brainteaser on whether or not an object will topple over, students can draw a plumb line between the object's centre of gravity and its base.
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