Block A in the fig. 5.58 weighs 1.20N and Block B weighs3.60N.

Khaleesi Herbert

Khaleesi Herbert

Answered question

2020-10-18

Block A in the fig. 5.58 weighs 1.20N and Block B weighs3.60N. The Coefficient of kinetic friction between all surfaces is0. 300. Find the magnitude of the horizontal force F necessary to drag black B to the left at a constant speed a) if A rest on B and moves with it (fig. 5.28am). b) If A is held at rest.
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Answer & Explanation

Macsen Nixon

Macsen Nixon

Skilled2020-10-19Added 117 answers

The easiest method to complete portion (a) is to think of the blocks as a single unit with a weight of 4.80 N. The friction force that the force F must overcome is then 34.8=1.44N to three digits, and the normal force between block B and the lower surface is 4.80N.  

Since block A is moving in relation to block B, there is a friction force between the two blocks of size .31.2=.360 N. As a result, the total frictionforce F must overcome 1.44+.36=1.8N while the normal force between block B and the lower surface is still 4.80 N. 

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