Question Video: Measuring Maximum Length of an Irregular Object | Nagwa Question Video: Measuring Maximum Length of an Irregular Object | Nagwa

Question Video: Measuring Maximum Length of an Irregular Object Physics • First Year of Secondary School

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An irregular object is measured with a ruler to find its maximum length. Which of the following best shows how to use a ruler to take this measurement? [A] Option A [B] Option B [C] Option C [D] Option D

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Video Transcript

An irregular object is measured with a ruler to find its maximum length. Which of the following best shows how to use a ruler to take this measurement? Is it (A), (B), (C), or (D)?

Here in this question, we’re given an irregular object that we want to measure the length of. We are shown four different options of where we can place our ruler to get a measurement and are asked to figure out which option is the best way to measure this object with it.

First, we should remember some information about rulers and how to take accurate measurements with them. Rulers are made from a straight strip of material and are marked along its length at different measurements. Rulers always begin at zero and increase in value as you move to the end of it. When measuring a length, the zero mark of the ruler must be placed in line with the end of the length. We also have to set the ruler parallel to the object we are measuring in order to get the accurate length of it.

Take a look at the irregular object we are trying to measure. It looks like a rectangle with two corners cut off at an angle. So the top length and the bottom length, the blue line, are the same length but are not the entire length of our object. Notice that the center of our object, the red line, actually has the longest length. We should do our measurements along the centerline of our object, so we can already eliminate the first two options from being correct, because the ruler is lying along the top edge and bottom edge in them.

Looking at the two options that are measuring the center of our object, one of them has the ruler in front of the object and the other is behind the object. In order to properly measure the length of the object, we would obviously need to see the markings on the ruler, so we should always put the ruler in a position where we can read the measurements along it.

Therefore, option (C), measuring the object along the centerline with the ruler on top of the object is the correct answer.

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