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Use the convention that to the right is positive, and to the left is negative. (every answer should be overtly labeled + or -)
+2.43 m/s/s
-2.70 m/s/s
-10.0 N
-32.6 N
+39.7 N
1. There is a coefficient of kinetic friction of 0.140 between a 5.20 kg box and the level floor.
a. If the box is sliding to the left, and we exert a force of 5.50 N to the right, what is the acceleration?
b. If the box is sliding to the right, and we exert a force of 6.90 N to the left, what is the acceleration?
c. The box is sliding to the right, but is decelerating at 3.30 m/s/s, what outside force besides friction is acting on it?
d. If the box is sliding and accelerating to the left at 4.90 m/s/s, what force must be acting on it?
e. The box slides from rest to the right reaching a velocity of 14.5 m/s in a distance of 16.8 m. What outside force was acting?
+0.696 m/s/s
+0.462 m/s/s
+25.3 N
+28.8 N
+6.75 m/s
-1.48 m/s/s
-4.53 m/s/s
-2.01 N
-36.1 N
+72.4 N
-2.87 m/s/s
-0.518 m/s/s
+18.5 N
-10.1 N
-13.7 N
+0.780 m/s/s
+1.62 m/s/s
-37.1 N
-8.99 N
+10.9 m/s
2. There is a coefficient of kinetic friction of 0.105 between a 4.75 kg block of wood and the level floor.
1:37 Practice 4 3 #2
a. If there is a force of 8.20 N to the right, and the block is sliding to the right, what is the acceleration?
2:03 Practice 4 3 #2a
b. If the block is sliding to the left, and there is a force of 2.70 N to the left, what is the acceleration of the block?
2:14 Practice 4 3 #2b
c. What applied force would make the block accelerate and slide to the right at 4.30 m/s/s?
2:07 Practice 4 3 #2c
d. If the block is sliding to the left, but is decelerating at 7.10 m/s/s, what force must be applied to it?
2:20 Practice 4 3 #2d
e. If you apply 8.90 N to the right and the block starts to slide to the right from rest, what will be the velocity in 8.00 seconds?
2:34 Practice 4 3 #2e
3. There is a coefficient of kinetic friction of 0.310 between an 8.35 kg block of wood and the level floor.
1:55 Practice 4 3 #3
a. If the block is sliding to the right, and there is a force of 13.0 N to the right, what is the acceleration?
1:30 Practice 4 3 #3a
b. If the block is sliding to the right, but there is a force of 12.4 N to the left, what is the acceleration?
1:31 Practice 4 3 #3b
c. If the block is sliding to the left, but is decelerating at 2.80 m/s/s, what outside force must be acting?
2:27 Practice 4 3 #3c
d. If the block is sliding to the right, but is decelerating at 7.36 m/s/s, what is the force acting on the block?
1:55 Practice 4 3 #3d
e. From rest the block reaches a speed of 15.0 m/s from rest in a distance of 20.0 m. What force was acting?
2:26 Practice 4 3 #3e
4. There is a coefficient of kinetic friction of 0.155 between a 3.10 kg block of wood and the level floor.
a. If the block is sliding to the right, and you exert a force of 4.19 N to the left, what is the acceleration?
b. If the block is sliding to the left, and you exert a force of 6.32 N to the left, what is the acceleration?
c. If the block is sliding and accelerating to the right at 4.45 m/s/s, what force must be applied?
d. If the block is sliding to the left and accelerating to the left at 1.75 m/s/s, what force must be applied?
e. The block displaces itself to the left 12.0 m from rest in 2.87 s. What force must have acted?
5. There is a coefficient of kinetic friction of 0.235 between an 8.85 kg box and the level floor.
a. If the box is sliding to the left, and there is a force of 13.5 N to the left, what is the acceleration?
b. If the box is accelerating to the right, and there is a force of 34.7 N to the right, what is the acceleration?
c. If the box is sliding to the right, but is decelerating at 6.50 m/s/s, what force must be acting on the box?
d. If the box is sliding to the left, but is decelerating at 1.29 m/s/s, what must be the force acting on the box?
e. If the box is sliding to the right, and there is a force of 32.0 N to the right, what will be its final velocity from rest when is has gone 45.0 m?
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