Among the following, which one statement about friction is not true ?

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Q: 22 (SCRA/2014)
Among the following, which one statement about friction is not true ?

question_subject: 

General Knowledge

question_exam: 

SCRA

stats: 

0,8,13,1,8,7,5

keywords: 

{'friction': [0, 0, 1, 1], 'more friction': [0, 0, 0, 1], 'efficiency': [0, 0, 1, 0], 'machine': [0, 0, 4, 3], 'motions': [0, 0, 1, 3], 'heavy object': [0, 0, 0, 1]}