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Predict/Explain You push two identical bricks across a
Chapter 6, Problem 1P(choose chapter or problem)
CE Predict/Explain You push two identical bricks across a tabletop with constant speed, v, as shown in Figure 6–16. In case 1, you place the bricks end to end; in case 2, you stack the bricks
one on top of the other. (a) Is the force of kinetic friction in case 1 greater than, less than, or equal to the force of kinetic friction in case 2? (b) Choose the best explanation from among the
following:
I. The normal force in case 2 is larger, and hence the bricks
press down more firmly against the tabletop.
II. The normal force is the same in the two cases, and friction
is independent of surface area.
III. Case 1 has more surface area in contact with the tabletop,
and this leads to more friction.
Questions & Answers
QUESTION:
CE Predict/Explain You push two identical bricks across a tabletop with constant speed, v, as shown in Figure 6–16. In case 1, you place the bricks end to end; in case 2, you stack the bricks
one on top of the other. (a) Is the force of kinetic friction in case 1 greater than, less than, or equal to the force of kinetic friction in case 2? (b) Choose the best explanation from among the
following:
I. The normal force in case 2 is larger, and hence the bricks
press down more firmly against the tabletop.
II. The normal force is the same in the two cases, and friction
is independent of surface area.
III. Case 1 has more surface area in contact with the tabletop,
and this leads to more friction.
ANSWER:
Step 1 of 2
a)
The force of kinetic friction is same for both the cases. As,
.
The force is same for both the cases.