A) Speak and listen
B) Write and walk
C) Speak and walk
D) Write and listen
Correct Answer: B
Solution :
Friction is an important aspect of life. We are able to walk on a surface because of the presence of friction between the ground surface and our feet. If friction were to become zero, then the act of walking would become impossible, causing us to slip and fall. One is able to write on a surface (for example, a blackboard) only if friction is present on the surface. We are able to write on a blackboard because of the presence of friction between the board and the chalk. The correct answer is B.
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