Q

# You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. In reality, one is heavier than other Can you say which one is heavier and why?

You have a bag of cotton and an iron bar, each indicating a mass of  $\inline 100\; kg$  when measured on a weighing machine. In reality, one is heavier than other. Can you say which one is heavier and why?