Step-by-step explanation:
Disadvantages of Friction:
1 . Friction produces unnecessary heat leading to the wastage of energy.
2. The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving objects.
3. Forest fires are caused due to the friction between tree branches.
4 . A lot of money goes into preventing friction and the usual wear and tear caused by it by using techniques like greasing and oiling