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Predict/Explain You push two identical bricks across a

Chapter 6, Problem 1P

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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.

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.

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