In the figure, a block weighing 23.0 N is held at rest against a vertical wall by a horizontal forceof magnitude 61 N. The coefficient of static friction between the wall and the block is 0.55, and the coefficient of kinetic frictionbetween them is 0.38. In six experiments, a second forcePis applied to the block and directed parallel to the wall with these magnitudes and directions: (a)35 N, up, (b) 13 N, up, (c)48 N, up, (d)62N, up, (e)9.1 N, down, and (f)19 N, down. In each experiment, what is the frictional force on the block, including sign? Take the directionup the wall as positive, and down the wall as negative. Next, calculate the acceleration, including sign, of the block in each case. Notethat acceleration is zero if the block does not move.(g) What is the acceleration in (a)?(h) What is the acceleration in (b)?(i) What is the acceleration in (c)?(i) What is the acceleration in (d)?(k) What is the acceleration in (e)?(1) What is the acceleration in (f)?

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Asked Oct 14, 2019
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In the figure, a block weighing 23.0 N is held at rest against a vertical wall by a horizontal force
of magnitude 61 N. The coefficient of static friction between the wall and the block is 0.55, and the coefficient of kinetic friction
between them is 0.38. In six experiments, a second force
P
is applied to the block and directed parallel to the wall with these magnitudes and directions: (a)35 N, up, (b) 13 N, up, (c)48 N, up, (d)62
N, up, (e)9.1 N, down, and (f)19 N, down. In each experiment, what is the frictional force on the block, including sign? Take the direction
up the wall as positive, and down the wall as negative. Next, calculate the acceleration, including sign, of the block in each case. Note
that acceleration is zero if the block does not move.
(g) What is the acceleration in (a)?
(h) What is the acceleration in (b)?
(i) What is the acceleration in (c)?
(i) What is the acceleration in (d)?
(k) What is the acceleration in (e)?
(1) What is the acceleration in (f)?
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In the figure, a block weighing 23.0 N is held at rest against a vertical wall by a horizontal force of magnitude 61 N. The coefficient of static friction between the wall and the block is 0.55, and the coefficient of kinetic friction between them is 0.38. In six experiments, a second force P is applied to the block and directed parallel to the wall with these magnitudes and directions: (a)35 N, up, (b) 13 N, up, (c)48 N, up, (d)62 N, up, (e)9.1 N, down, and (f)19 N, down. In each experiment, what is the frictional force on the block, including sign? Take the direction up the wall as positive, and down the wall as negative. Next, calculate the acceleration, including sign, of the block in each case. Note that acceleration is zero if the block does not move. (g) What is the acceleration in (a)? (h) What is the acceleration in (b)? (i) What is the acceleration in (c)? (i) What is the acceleration in (d)? (k) What is the acceleration in (e)? (1) What is the acceleration in (f)?

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Expert Answer

Step 1

Write an expression for kinetic frictional force

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Step 2

Substitute the values

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(0.55)(61 N) =33.55 N

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Step 3

Write an expression for kine...

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f4N

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