How is friction disadvantageous to us?

Friction is disadvantageous to us due to following reasons :

• Friction causes wear and tear of the rubbing surfaces. It damages the moving parts of a machine with time, tyres of vehicles and even the soles of our footwear.
• As friction produces heat, different parts of rotating machines get damaged with time and need periodic replacement. Sometimes, we need to make provisions for constant cooling of moving parts of big machines to avoid wear and tear which increases the cost of maintenance.
• Friction causes wastage of energy. We have to spend extra energy on machines to overcome friction. This decreases the efficiency of machines.