In Figure 6-63, a block weighing 22 N is held at rest against avertical wall by a horizontal force of magnitude 60 N. Thecoefficient of static friction between the wall and the block is0.53, and the coefficient of kinetic friction between them is 0.36.In six experiments, a second force is applied to the block anddirected parallel to the wall with these magnitudes and directions:(a) 35 N, up, (b) 12 N, up, (c) 47 N, up, (d) 63 N, up, (e) 4.1 N,down, and (f) 21 N, down. In each experiment, what is thefrictional 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 eachcase. Note that acceleration is zero if the block does notmove.
(g) What is the acceleration in (a)?
(h) What is the acceleration in (b)?
(i) What is the acceleration in (c)?
(j) What is the acceleration in (d)?
(k) What is the acceleration in (e)?
(l) What is the acceleration in (f)?
In Figure 6-63, a block weighing 22 N is held at rest against avertical wall by a horizontal force of magnitude 60 N. Thecoefficient of static friction between the wall and the block is0.53, and the coefficient of kinetic friction between them is 0.36.In six experiments, a second force is applied to the block anddirected parallel to the wall with these magnitudes and directions:(a) 35 N, up, (b) 12 N, up, (c) 47 N, up, (d) 63 N, up, (e) 4.1 N,down, and (f) 21 N, down. In each experiment, what is thefrictional 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 eachcase. Note that acceleration is zero if the block does notmove.
(g) What is the acceleration in (a)?
(h) What is the acceleration in (b)?
(i) What is the acceleration in (c)?
(j) What is the acceleration in (d)?
(k) What is the acceleration in (e)?
(l) What is the acceleration in (f)?
