A 0.4 kg block rests on a desk. The coefficient of static friction is 0.2. You push the side of the block but do not have a spring scale to measure the force you use. The block does not move. Which statement is true about the force of static friction?

Question

Anonymous · Answer

Static friction is greater than Applied force

LucianoBordoli · Answer

D. It is no smaller than 0.78 N ;

LucianoBordoli · Answer

The maximum force of static friction on the block is approximately 0.7848 N due to its mass and the coefficient of static friction. Since the block does not move when pushed, the static friction matches the applied force up to this maximum. Therefore, the correct statement is that the force of static friction is no larger than 0.78 N. 
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A 0.4 kg block rests on a desk. The coefficient of static friction is 0.2. You push the side of the block but do not have a spring scale to measure the force you use. The block does not move. Which statement is true about the force of static friction?

Answer (3)

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