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moving at 0 m/s. So the change in velocity is 10 m/s. We can ignore the negative sign, it is just telling us that this is a deceleration instead of an acceleration. Since this change in velocity accurs across 0.10 seconds, we see 10 m/s divided by 0.1 seconds, for an acceleration of 100 m/s2. So the applied force is 50 newtons: 10 1 0:1 F 0:5 100 F 0:5 F 50 A soft wall changes the velocity to zero across 0.25 seconds, for an acceleration of 40 m/s. The soft wall only needs to apply 20 newtons of force, but it does it across a longer time span: 10 0:25 F 0:5 40 F 0:5 F 20 3 0.5 kg at 10 m/s has a kinetic energy of 25 joules. This is a straigtforward solution of the kinetic energy formula: 0:5 102 2 KE 0:25 100 KE KE 25 At 20 m/s, the kinetic energy is quite a bit larger: 0:5 202 2 KE 0:25 400 KE KE 100 4. Another easy solution, using the potential energy equation: PE 0:5 9:8 4 PE 19:6 Now, you know that the ball dropped from 4 meters, so the time it would take to hit the ground is 0.9 seconds. Since it crossed these 4 meters in 0.9 seconds, you might think that its velocity is 0.9 m/s,



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Now that the principle of operation of both sliding and rolling bearings is clear, it is a good idea to have some sort of comparison between the two which will provide designers with guidelines for the selection of bearings This comparison is presented in Table 67 Generally, each type of bearing has its own advantages depending on the application Certain criteria that are useful when choosing a bearing type are load magnitude and direction, space available, limiting speeds, type of lubrication, environment, rigidity, angular misalignment and economic cost Rolling element bearings are more desirable in terms of their low starting and good operating friction, the ability to support combined radial and thrust loads, less sensitivity to interruptions in lubrication, no self-excited instabilities, good low-temperature starting and the ability to seal the





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When you are experimenting with a new circuit, you normally want to put it together in a temporary fashion to test it. Test versions of a circuit are prototypes, and prototyping boards, often called breadboards, make it easy to quickly wire a circuit. An example breadboard is shown in Fig. 5-3. Once a circuit has been tested, you may want to make a permanent version using either a generic or custom circuit board. Each hole in the breadboard is a socket that you plug wires or components into. The holes are connected together in a standard pattern, as shown in Fig. 5-4. The long bus or rail, a series of connected holes on the outside edges of the breadboard, is normally wired to the power supply. I usually take a red and black permanent marker and draw lines along these holes, to identify which strip is which. Black is the color traditionally used to represent ground and

Precision Engineering Selection of bearing types [6]

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Characteristics Unidirectional Cyclic Starting Unbalance Shock Emergency Operational speed Load Sliding Good Good Poor Good Fair Fair Are well suited for high rotating speeds with impact and momentary overloads, the higher the rotating speed, the more effective is the hydrodynamic pumping action Turbulence Temperature rise Fair Rolling Excellent Excellent Excellent Excellent Excellent Fair Rapid accumulations for fatigue cycles and high centrifugal force

Fig. 5-5.

Centrifugal loading Dynamic effects Poor in all ball bearings except where designed for at sacrifice of load capacity Good in spherical roller bearings Poor in cylindrical bearings Low friction can be achieved Low starting friction, so only with full-film lubrication low resistance at start up which cannot be achieved and hence low heat during start up This requires generation at the same hydrostatic lubrication which operating conditions needs a costly external system Small Large 1 1 /4 to two times the shaft /5 to 1 2 the shaft / diameter diameter Often permits limited emergency operation after failure Good Oil or other fluid, grease, dry lubricants, air or gas Limited operation may continue after fatigue failure but not after lubricant failure Poor Oil or grease (Contd)

Rolling Element, Hydrodynamic and Hydrostatic Bearings Table 67 (Contd)

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