A student tries to find the density of a metal block. First he measures the weight with a forcemeter (spring balance). Next he measures the sides of the block using a rule, in order to calculate the volume of the block. Finally he divides the weight by the volume to find the density.
The student has made a mistake.
Why does his method not give the density?
1 )
Density is volume divided by weight.
2 )
He should have measured the surface area, not the volume.
He should have used the mass in his calculation, not the weight.
4 )
Weight is not measured with a forcemeter (spring balance).
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