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The total energy is the same, it has just changed from one form (motion) to another (heat) Even when you squeeze or stretch a spring there is friction, only this friction is inside the spring Some of the force you apply to the spring turns into heat as the spring moves You can feel this internal friction yourself with a coat hanger Get a wire coat hanger that nobody will mind you breaking Now, grab it rmly in both hands and make a sharp bend in it Now bend it back the other way Do this a few times quickly, and the bend will become very hot Do it enough, and the hanger breaks We normally want to preserve the kinetic energy of an object and keep it from being converted to heat Motion is useful and, unless you are cooking something, heat is not.

TDM systems to increased capacities. DWDM routers necessary to implement the system are more expensive than the older SONET TDM systems. TDM systems that have been around longer are more readily available. DWDM will be necessary in areas where extremely high traffic occurs over relatively large areas. An example of this is metropolitan New York and New Jersey. The need for an extremely high-speed network actually may exceed the capacity of current TDM systems.

The ultrasonic transmitter (see Fig. 5.36) is built around a CMOS 555 timer set up in astable mode. R2 is a PC-mounted 4.7K-ohm potentiometer and is used to adjust the frequency output.

There are di erent ways of doing this, such as lubrication or ball-bearings We ll look at these friction-reducing ideas later..

Tuning the transmitter Set up the ultrasonic transducers so that they are directly facing one another about 4 to 5 apart (see Fig. 5.37). Connect the VOM to the circuit as shown in the insert in Fig. 5.35. (Leave the comparator section off.) Set the VOM to read volts DC. You will need to read about 2 V; set the range on the VOM accordingly. Turn on both circuits. Adjust R2 of the transmitter so that you obtain the peak voltage output shown on the voltmeter. This should read about 2 VDC. Adjusting the CMOS comparator After tuning the transmitter, we need to set the receiver s comparator circuit. Disconnect the VOM from the receiver section and connect the CMOS comparator. Rearrange the transducers so that they are lying side by side about half an inch apart facing in the same direction. Place a flat-sided solid object about 3 in front

Metropolitan Area Networks (MANs)

Summary

7 6 2 1

In this chapter, we introduced a bunch of mechanical forces, their meaning, and symbols to represent them. We learned how to describe something s position in space and its distance from another object. We learned about the energy in moving objects as well as the force and energy needed to change an object s motion, not to mention the di erence between force and energy. Finally, we took a look at storing energy in springs and how energy is lost through friction.

R3 220