Going through physics when I ran into this issue. I just want to make sure my thinking is correct.
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View attachment 213333
The way they explained the answer was that the normal force is smaller in setup II as compared to setup III because the rope is lifting the block off the ground, therefore decreasing the contact pressure between the block and ground. Since setup II has a smaller normal force, and because friction is proportional to normal force, setup...
Tension problem
View attachment 213332
View attachment 213333
The way they explained the answer was that the normal force is smaller in setup II as compared to setup III because the rope is lifting the block off the ground, therefore decreasing the contact pressure between the block and ground. Since setup II has a smaller normal force, and because friction is proportional to normal force, setup...
Tension problem