As shown in the figure, a 10-N block is moved in a horizontal square having side

Question

As shown in the figure, a 10-N block is moved in a horizontal square having side lengths of 2.0 m (see top view in figure). As shown in the side view on the right side of the figure, the pushing force on the block is always horizontal, and the coefficient of kinetic friction between the block and the surface on which it slides is 0.5; therefore, the size of the force of kinetic friction on the block by the surface is always 5.0 N. For the leg of the trip from A to B, and also for the entire roundtrip, find the work done on the block by the force of friction on the block by the surface.

I think its b, but I just wanted to get some clarification.

a. 20 J from A to B, 40 J for roundtrip b. 10 J from A to B, zero for roundtrip c. 20 J from A to B, zero for roundtrip d. 10 J from A to B, 20 J for roundtrip e. 20 J from A to B, 80 J for roundtrip f. 10 J from A to B,  40 J for roundtrip 2 m 2 m 2 m 10 N A 10 N leg A to B looking W Im top view

Explanation / Answer

Work done by friction force-

From A to B, Wf = -fr * d

Wf = -5 * 2

Wf = -10 J

For entire roundtrip -

Net displacement will be 0 as initial and final position of block is same.

Wf = -5 * 0

Wf = 0

option (b) is correct.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.