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6. Which situation shows the disadvantage of friction?
a. It helps us walk and run on the ground
b. Brakes in a car make use of friction to stop the car
c. Asteroids are burnt in the atmosphere before reaching Earth due to friction.
d. It produces unnecessary heat leading to the wastage of energy
7. Which situation shows the advantage of friction?
a. It slows down the motion of moving objects.
b. Forest fires are caused due to the friction between tree branches.
c. It keeps appliances, furniture, etc. be fixed in their place
d. A lot of money goes into preventing friction​