disadvantages and advantages of friction pls list 4-4 each 

Advantages 1. help us to walk 2. Movement of vehicles 3. Spiked shoes for better grip 4. Writing work 5. Application of brakes 6. Lightning a matchstick 7. Screws and nails Disadvantage 1. Damage to engines 2. Worn out tyres 3. Loss of energy 4. Reduces the efficiency of machines

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Advantages
1-friction help us to write
2-due to friction we can walk
Disadvantages
1-friction wears and tears soles of our shoes

 
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pls list 4 advantages i have exam 
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this
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