Fig. 3 shows a steel rule and a measuring tape. The metal has been selected for its specific properties that make it suitable for this application. Differen...
Question 1 Report
Fig. 3 shows a steel rule and a measuring tape. The metal has been selected for its specific properties that make it suitable for this application. Different metals have different properties that affect how they can be worked and used. The choice of metal depends on the functional requirements of the product.
The paint keeps out the damp. It can be moved to a new spot. The parts fit well. It stays cool in the heat.
(a) Give the accuracy of measurement that can be achieved using a steel rule. [1]
(b) State one advantage of using a measuring tape instead of a steel rule when measuring the length of a large curved surface. [1]
Answer Details
(a) The accuracy of measurement that can be achieved using a steel rule is 1 mm (or 0.5 mm if the rule has half-millimetre graduations). [1] A steel rule is graduated with millimetre markings along its edge, so the smallest division that can be read directly determines the accuracy. Some rules allow estimation to the nearest half millimetre.
(b) One advantage of using a measuring tape instead of a steel rule when measuring the length of a large curved surface:
A measuring tape is flexible, so it can follow the contour and shape of a curved surface, giving an accurate measurement along the actual surface path. [1] A rigid steel rule cannot bend to conform to a curve, so it would only measure the straight-line distance (chord) between two points, not the true surface length. Additionally, measuring tapes are typically much longer than steel rules (often 3-8 metres), so large distances can be measured in a single span without repositioning.
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