A block weighing 13 N is held at rest against a vertical wall by a horizontal fo

Question

A block weighing 13 N is held at rest against a vertical wall by a horizontal force of magnitude 60 N. The coefficient of static friction between the wall and the block is 0.59and the coefficient of kinetic friction between them is 0.32. In six experiments, a second force is applied to the block and directed parallel to the wall with the following magnitudes and directions. 32.4 N, up What is the magnitude of the frictional force on the block? 28.4 N, up What is the magnitude of the frictional force on the block? 44.4 N, up What is the magnitude of the frictional force on the block? 52.4 N, up What is the magnitude of the frictional force on the block? 21.4 N, down What is the magnitude of the frictional force on the block? 31.4 N, down What is the magnitude of the frictional force on the block? In which does the block move up the wall? (Select all that apply.) In which does the block move down the wall? (Select all that apply.) In which is the frictional force directed down the wall? (Select all that apply.)

Explanation / Answer

a) 32.4-13= 19.4 down

b)28.4-13=15.4 down

c)44.4-13=31.4 down

d)19.2 kinetic friction

e)21.4+13=34.4 up

f)19.2 kinetic friction

g)in part D

h) in part F.

i) in part A,B,C,D.

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