Question

list three disadvantages of friction

Answer 1

* It produces heats 4. Due to friction, noise is also produced in machines.
* Due to friction, engines of automobiles consume more fuel which is a money loss. 
* Machine efficency is decreased: energy input is lost to heat
* It produces noice pollution

Answer 2

1. Due to friction object cannot be in continuous motion

2. It causes loss of heat. For example_ In our hand, if we rub our hand heat is continuously lossing. Hence we feel our hand to be warm

3. It reduces efficiency of Machine.