Question

1) You are moving into a new apartment, and you are trying to slide your 100 kg sofa into place. Your lazy 40 kg mass dog won’t move their butt off the sofa while you try to slide it. The coefficient of static friction between the four feet of the sofa is 0.4. How much horizontal force do you have to apply to get the sofa started moving? 1,372 N 823 N 157 N 549 N 392 N 2) You are moving your 100 kg sofa in the back of a pick up truck, but the sofa is too long. The back of the truck won’t close. You’ve taken the feet off the sofa, and the coefficient of static friction between the sofa and the bed of the truck is 0.2. With what acceleration can you pull out horizontally from rest at a traffic light without the sofa sliding out the back of the bed? 2.0 m/s2 1.2 m/s2 0.77 m/s2 2.7 m/s2 1.6 m/s2

          1) You are moving into a new apartment, and you are trying to
slide your 100 kg sofa into place. Your lazy 40 kg mass dog won’t
move their butt off the sofa while you try to slide it. The
coefficient of static friction between the four feet of the sofa is
0.4. How much horizontal force do you have to apply to get the sofa
started moving?
1,372 N
823 N
157 N
549 N
392 N
2) You are moving your 100 kg sofa in the back of a pick up
truck, but the sofa is too long. The back of the truck won’t close.
You’ve taken the feet off the sofa, and the coefficient of static
friction between the sofa and the bed of the truck is 0.2. With
what acceleration can you pull out horizontally from rest at a
traffic light without the sofa sliding out the back of the bed?
2.0 m/s2
1.2 m/s2
0.77 m/s2
2.7 m/s2
1.6 m/s2

Added by Alicia P.

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