Swings and merry-go-rounds do not exhibit linear motion. Instead, swings exhibit periodic motion as they swing back and forth, while merry-go-rounds demonstrate rotational motion as they spin around a central point, both involving circular paths.
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A reference point is a fixed location or object used to determine the position or motion of another object. It provides a basis for measuring distance, direction, and movement, helping to describe the location of an object relative to it.
Tape and rod measure length like a scale but are more flexible and suited for different contexts. “Char angula” refers to an old measurement unit, meaning “four fingers” or roughly 7-10 cm, used in traditional contexts.
The meter is convenient for measuring lengths like a railway track, but not for smaller measurements such as the thickness of a book page. For small lengths, units like millimeters are more precise.
If the ends of the scale are broken, measure from a known reference point to a point along the scale. Use a piece of string or another ruler to measure the length accurately from these points.