WELCOME TO PERIOD 11 Homework Exercise #10 is due today.
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1 WELCOME TO PERIO 11 Homework Exercise #10 is due today. Midterm 1 grade ranges: A: correct (91% 100%) B: correct (79% 88%) C: correct (58% 76%) : correct (40% 55%) E: 0 12 correct (0% 37%)
2 PHYSICS 1103 PERIO 11 How do wheels and axles work? What is a hydraulic system? What are complex maches? Remember to put away your phone. No calls or textg durg class.
3 Review: Work done with maches Maches cannot reduce the amount of work needed to perform a task. However, maches make it possible to use less put force applied over a longer distance. Ignorg energy wasted by friction, the work put to a mache equals the work done by the mache: Work = Work Because some energy is always wasted overcomg frictional forces, the amount of work required usg a mache is greater than the amount of work required with a mache.
4 Review: Mechanical advantage Ideal mechanical advantage ignores any energy wasted by friction. MA ideal Actual mechanical advantage takes to account the energy wasted by friction. MA actual
5 Wheels and axles: speed With each turn of the axle both wheels rotate one turn. If the wheels have different diameters, the edge of each wheel turns a different distance and speed. The large wheel turns a longer distance at a faster speed. The small wheel turns a shorter distance at a slower speed.
6 Wheels and axles: force When wheels of different diameters are attached to an axle, they trade force for distance. The force that the rim of the small wheel can exert is greater than the force applied to the rim of the large wheel. To crease the force exerted by a wheel and axle, apply force to the larger wheel. To crease the speed of a wheel and axle, apply force to the smaller wheel or to the axle.
7 Efficiency of maches W Efficiency W W = work put to the mache (joules or ft-lbs) W = work done by the mache (joules or ft-lbs) Sce Work = orce x istance, Efficiency W W
8 Wheel and axle example Measure the distances and Solve x = x for Hang weights = from the middle of the bottle. 5 N? N
9 Hydraulic systems Less force is required to push the narrow piston because the piston exerts force over a smaller area of fluid. The narrow piston moves a longer distance. A greater force results when the hydraulic fluid exerts force on the wide piston. The wide piston moves a shorter distance.
10 Efficiency as a ratio of mechanical advantages Efficiency W W The efficiency equation volves two familiar ratios: MA actual and MA ideal Substitutg these ratios to the efficiency equations gives Efficiency MA MA actual ideal
11 Gears The edges of meshed gears move the same distance durg every turn. Gears of different diameters differ their speed of rotation and number of turns. If a large gear has twice the diameter of a small gear, the small gear turns two times for every one turn of the large gear. The small gear turns faster. The large gear turns slower.
12 Complex maches Complex maches are combations of two or more simple maches. The mechanical advantage of a complex mache is the product of the MA of its component maches. M A complex = M A 1 x M A 2 x M A 3 The efficiency of a complex mache is the product of the efficiencies of its component maches. Eff complex = Eff 1 x Eff 2 x Eff 3
13 A bicycle d MAideal of the front and rear sprockets. MA ideal d the complex MA. M A complex = MA 1 x MA 2 Large wheel creases speed. d the distance the rear wheel turns one revolution. Circumference = 2 p r Gears lked by a cha crease speed or pedalg force. Pedal cranks crease pedalg force.
14 BEORE THE NEXT CLASS Read textbook chapter 12 Complete Homework Exercise 11 Brg a blank Activity Sheet 12 to class.
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