answer the following
Answers
Answer1: Interlocking means "two objects perfectly fitting so that they unite and move together" When two rough surfaces come in contact with each other, they can get interlocked, when the irregularities on each surface match. This cause friction force.
Answer2: Disadvantages of friction:
It always resists the motion, so extra energy is required to overcome it.
It causes wear and tear of machines.
It decreases the life expectancy of moving parts of vehicles.
Since friction is very useful in some cases while harmful in some cases, friction is called a necessary evil.
Answer3: The soles of shoes are worn out due to the effect of friction . The soles of shoes increase the friction between surfaces because it makes the surface of the shoes rough . Thus , this is due to the fact that friction causes wear and tear of objects and reduces the life of the object
1. when two surfaces come in contact with each other, the irregularities get into each other and they interlock with each other and so this is called interlocking
2. the disadvantages of friction are
a) it makes the tyres of the cars to wear out
b) friction causes wear and tear
c) it resists the motion and so extra energy is required to overcome
3. the sole of our shoes get worn out after a period of time due to friction