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Why are there two different types of friction ? Describe each of these and list their similarities and differences .
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- Tires that are rolling across the road use static friction, and tires that slide across the road use kinetic friction. Which combination of motion and coefficient of friction (between the tire and the road) would allow a car to stop in the shortest amount of time? Your answer: a high coefficient of friction with a tire that rolls across the road a high coefficient of friction with a tire that slides across the road a low coefficient of friction with a tire that rolls across the road a low coefficient of friction with a tire that slides across the roadWe often think of friction and air resistance as forces that we want to minimize because they can hinder the motion of an object. But they are not always undesirable, and in fact, can be an essential element in a machine or process. Identify one or two applications that depend on friction and air resistance. Explain how friction or air resistance works in those situations and what would happen if there were no friction or air resistance. Your initial post should be 75-150 words in length and is due on Sunday.A book slides across a level, carpeted floor with an initial speed of 3.85 m/s and comes to rest after 3.75 m. Calculate the coefficient of kinetic friction between the book and the carpet. Assume the only forces acting on the book are friction, weight, and the normal force. μ = X10 TOOLS
- In many textbook problems, we ignore certain complications such as friction and drag. The problems contain key words that indicate such a simplification is being used. For example, if a surface is described as slippery, it means that we can ignore friction. Look at the previous chapters problem sets. Find five uses of these key words and explain how to interpret each case.Review. A rifle bullet with a mass of 12.0 g traveling toward the right at 260 m/s strikes a large hag of sand and penetrates it to a depth of 23.0 cm. Determine the magnitude and direction of the friction force (assumed constant) that acts on the bullet.Lisa measured the coefficient of static friction between two pairs of running shoes and the track in Example 6.1 (page 159). If she wants to have an advantage in a race, which shoes should she wear, the ones with a high coefficient or the ones with the low coefficient of static friction? Explain.
- To determine the coefficients of friction between rubber and various surfaces, a student uses a rubber eraser and an incline. In one experiment, the eraser begins to slip down the incline when the angle of inclination is 36.0 and then moves down the incline with constant speed when the angle is reduced to 30.0. From these data, determine the coefficients of static and kinetic friction for this experiment.A certain orthodontist uses a wire brace to align a patients crooked tooth as in Figure P5.4. The tension in the wire is adjusted to have a magnitude of 18.0 N. Find the magnitude of the net force exerted by the wire on the crooked tooth.A desperate hiker has to think fast to help his friend who has fallen below him. Quickly, he ties a rope to a rock of mass ma and makes his way over the ledge (see the figure). If the coefficient of maximum static friction between the rock and the ground is µ, and the mass of the hiker is mâ, what is the maximum mass of the friend, mc, that the rock can hold so the hikers can then make their way up over the ledge? Assume the rope is parallel to the ground and the point where the rope passes over the ledge is frictionless. mc = Ju
- A 24-N force is applied to a 7-kg object to move it with a constant velocity of 6.8m / s across a level surface. The coefficient of friction between the object and the surface is approximately Round your answer to the hundredths place. Use g=10m/s^2Bob borrows a lunch tray of negligible mass to push Will on the tray across a level portion of the field. The coefficient of kinetic friction between the tray and the grass is 0.25 and the coefficient of static friction is 0.30. Will is pushed 40m across the field by Bob at a constant speed, but Bob is so tall that he pushes with a force of 40 degrees below the horizontal. Will gained some weight during quarantine, so he now weighs 120kg. a) What power does Bob need to move Will across the field in 20sec? b) What could Bob do to decrease the work he needs to push Will across the field without decreasing his force?The pulley system shown in the figure is used to lift a m= 67-kg crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume the masses of the chains, pulleys, and ropes are negligible. Determine the force F required to lift the crate with constant speed. Determine the tension in the upper chain. Determine the tension in the lower chain.
