Question

What observation and experiment can you cite to show the existence force Of friction

Answer 1

hey mate here is ur ans

●materials needed
a ball
a rough mat

◐process
lay the rough mat
roll the ball on it

⊙observation
the ball starts rolling and eventually slows down and comes to rest

●conclusion
a force of friction acts against the direction of motion

other eg....
In moving parts of machine there is wear and tear and heat is produced due to friction

hope it helps you
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have a great day ahead