Question

we cannot cut metal like aluminium and copper easily. why?​

Answer 1

$\large\blue{\textsf{✩ Your Answer ✓ }}$

This is because aluminium and copper are hard metals.They have the property of high rigidity.

$\small\bold{\textbf{\textsf{{\color{Purple}{Hope \: it \: helps}}}}}$

Answer 2

Answer:

Most of the metals are hard. The hardness varies from metal to metal. Most of the metals like iron, copper, aluminium, etc. are firm.

Explanation:

When some trace alloying elements are added to a metal, the molecules don't change much but there is a huge change in the yield strength and hardness. The latter change is due to the fact that the addition of some solute reduces the mobility of dislocations, which enhances the hardening effect. That's why metal can't be cut easily.