Properties and uses of some metals
2 marks · EasyA pure metal rod can be bent easily because its layers of atoms can slide. In an alloy rod, a force of 200 N is needed to cause bending, but in the pure metal it requires only 120 N. Calculate how many times harder the alloy rod is to bend compared to the pure metal (give your answer to 1 decimal place).
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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1.7 (±0.05)
Common mistakes: Dividing 120 by 200 instead of 200 by 120
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Marking points
M1 · 1 mark · Chooses correct calculation: divides alloy force by pure metal force
A1 · 1 mark · Correctly calculates 200 / 120 = 1.7 (1 decimal place)
Worked solution
To compare, divide the force needed for the alloy by the force for the pure metal:
Rounded to 1 decimal place: 1.7