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Chapter 6: Force and Motion-II

Fundamentals Of Physics
Pages: 124 - 148

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118 Questions for Chapter 6: Force and Motion-II

  1. A ski that is placed on snow will stick to the snow. However, when the ski is moved along the snow, the rubbing warms and partially melts the snow, reducing the coefficient of kinetic friction and promoting sliding. Waxing the ski makes it water repellent and reduces friction with the resulting layer of water. A magazine reports that a new type of plastic ski is especially water repellent and that, on a gentle 200 mslope in the Alps, a skier reduced his top-to-bottom time from 61 swith standard skis to 42 swith the new skis. Determine the magnitude of his average acceleration with (a) the standard skis and (b) the new skis. Assuming a 3.0°slope, compute the coefficient of kinetic friction for (c) the standard skis and (d) the new skis.

    Found on Page 148
  2. Question: Playing near a road construction site, a child falls over a barrier and down onto a dirt slope that is angled downward atto the horizontal. As the child slides downthe slope, he has an acceleration that has a magnitude of 0.50 m/s2and that is directed upthe slope. What is the coefficient of kinetic friction between the child and the slope?

    Found on Page 148
  3. A 100 Nforce, directed at an angleθabove a horizontal floor, is applied to a 25.0 kgchair sitting on the floor. Ifθ=0°, what are (a) the horizontal componentFhof the applied force and (b) the magnitudeNof the normal force of the floor on the chair? Ifθ=30.0°, what are (c)Fhand (d)FN? Ifθ=60.0°, what are (e)Fhand (f)FN? Now assume that the coefficient of static friction betweenchair and floor is 0.420. Does the chair slide or remain at rest ifθis (g)0°, (h)30.0°, and (i)60.0°

    Found on Page 148
  4. A certain string can withstand a maximum tension of 40 Nwithout breaking. A child ties a 0.37 kgstone to one end and, holding the other end, whirls the stone in a vertical circle of radius 0.91 M, slowly increasing the speed until the string breaks. (a) Where is the stone on its path when the string breaks? (b) What is the speed of the stone as the string breaks?

    Found on Page 148
  5. A four-person bobsled(totalmass=630kg)comes down a straightaway at the start of a bobsled run. The straightaway is 80.0 mlong and is inclined at a constant angle of10.2°with the horizontal. Assume that the combined effects of friction and air drag produce on the bobsled a constant force of 62.0 Nthat acts parallel to the incline and up the incline. Answer the following questions to three significant digits.

    Found on Page 148
  6. As a block 40Nslides down a plane that is inclined at25° to the horizontal, its acceleration is0.80m/s2 , directed up the plane. What is the coefficient of kinetic friction between the block and the plane?

    Found on Page 148
  7. Figure 6-20 shows an initially stationary block of masson a floor. A force of magnitudeis then applied at upward angleθ=20°.What is the magnitude of the acceleration of the block across the floor if the friction coefficients are (a)μs=0.600andμk=0.500and (b)μs=0.400andμk=0.300

    Found on Page 140
  8. In 1987, as a Halloween stunt, two skydivers passed a pumpkin back and forth between them while they were in free fall just west of Chicago. The stunt was great fun until the last skydiver with the pumpkin opened his parachute. The pumpkin broke free from his grip, plummeted about0.5 km, and ripped through the roof of a house, slammed into the kitchen floor, and splattered all over the newly remodeled kitchen. From the sky diver’s viewpoint and from the pumpkin’s viewpoint, why did the skydiver lose control of the pumpkin?

    Found on Page 139
  9. A person riding a Ferris wheel moves through positions at (1) the top, (2) the bottom, and (3) mid height. If the wheel rotates at a constant rate, rank these three positions according to (a) the magnitude of the person’s centripetal acceleration, (b) the magnitude of the net centripetal force on the person, and (c) the magnitude of the normal force on the person, greatest first.

    Found on Page 139
  10. A 68kgcrate is dragged across a floor by pulling on a rope attached to the crate and inclined 15°above the horizontal. (a) If the coefficient of static friction is 0.50, what minimum force magnitude is required from the rope to start the crate moving? (b) If μk=0.35 , what is the magnitude of the initial acceleration of the crate?

    Found on Page 140

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