Three identical blocks are being pulled or pushed across a horizontal surface by

Question

Three identical blocks are being pulled or pushed across a horizontal surface by a force F, as shown in the drawing. The force F in each case has the same magnitude. Rank the kinetic frictional forces that act on the blocks in ascending order (smallest first).

Choose one answer.

B, A, C C, A, B A, C, B C, B, A B, C, A Three identical blocks are being pulled or pushed across a horizontal surface by a force F, as shown in the drawing. The force F in each case has the same magnitude. Rank the kinetic frictional forces that act on the blocks in ascending order (smallest first). Pushing F kinetic Choose one answer. B, A, C C, A, B A, C, B C, B, A B, C, A

Explanation / Answer

We know that kinetic friction =?kN where N is the normal force.

For block A: Normal force=mg

block B: N=mg-(y component of F)

block C: N=mg+(y component of F)

Since ?k is a constant, kinetic friction is proportional to N,

so in ascending order, kinetic friction of:

Block B< Block A< Block C

B, A, C

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