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PASCO ME-8932 Instruction Manual

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Instruction Manual and
Experiment Guide for the
PASCO scientific
Model ME-8930
SMART TIMER

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Summary of Contents for PASCO ME-8932

  • Page 1 Instruction Manual and Experiment Guide for the PASCO scientific Model ME-8930 SMART TIMER...
  • Page 2 Smart Timer 012–06734A...
  • Page 4 Copyright Notice Equipment Return ä Limited Warranty...
  • Page 5 Smart Timer Introduction The PASCO ME-8930 Smart Timer is an accurate, versatile digital timer and measurement system for the student laboratory. The Smart Timer offers 0.1 ms timing resolution and an easy-to-use memory function. The Smart Timer measures several types of events detected with PASCO’s digital sensors, including speed and acceleration using...
  • Page 6 Smart Timer 012–06734A In One Gate Mode, a single photogate lets you measure the time, velocity, or acceleration of a fence as it passes through the photogate. Two photogates are used for collision experiments using one or two carts or for experiments where the velocity of a cart must be measured at two different points.
  • Page 7 012–06734A Smart Timer Equipment Included: Smart Timer Smart Timer Picket Fences (2) 9 VDC adapter liquid crystal display mode illustrations connector for 9VDC adapter (side panel)) battery compartment on/off switch (bottom panel) (side panel) input channel 2 touchpad keys input channel 1 9 VDC adapter 5 cm fence 1 cm flag...

  • Page 8: Operating The Smart Timer

    4. Slide the power switch to the ON position. The Smart Timer will “beep” and show PASCO scientific on the display. From this point, the three-step setup of the Smart Timer is easy: 1.
  • Page 9 012–06734A Smart Timer...

  • Page 10: Time Modes

    Smart Timer 012–06734A summary of the mode suggested for a given experimental activity can be found on page 5 Note: The (Quick Cross-Reference for Suggested Activities and Smart Timer Modes). Refer to the picket fence timing diagrams in Table 1 (pages 8 and 9) for a detailed look at how the Smart Timers supplied with the times events on its input(s) and an explanation of how speed and acceleration calculations Smart Timer is...

  • Page 11: Speed Modes

    012–06734A Smart Timer cleared and the “*” reappears. This RESET-START-STOP sequence is repeated for Note: each new elapsed time. Whenever the “*” is not showing, the mode may be The stopwatch changed. function is not a precision timing Using the Alternate Timing Function: Connect an appropriate accessory to input mode and is channel #1 or #2.

  • Page 14: Count Modes

    (positive number) and deceleration (negative number). Linear Pulley: In this mode, the Smart Timer converts rotary motion of a PASCO pulley to an equivalent linear acceleration in cm/s Angular Pulley: In this mode, the Smart Timer converts rotary motion of a PASCO...

  • Page 15: Test Mode

    9,999,999. Each count will be accompanied by a short beep. Used with a PASCO SN-7927 G-M Tube/ Power Supply, this mode is useful for group demonstrations to show the random nature of atomic disintegration and the inverse-square relationship between number of disintegration’s detected and distance from the radioactive source.

  • Page 16: Caring For The Smart Timer

    180 mA, maximum. Accessory Options The following PASCO accessories are available to help extend the utility of the Smart Timer. See the current PASCO catalog for more information. Accessory Photogate (ME-9204B): The stereo phone plug of the Accessory Photogate plugs into either of the phone jacks on the side of the Smart Timer, giving you the option of two identical photogates operating from a single timer.
  • Page 17 Smart Timer Time-of-Flight Accessory (ME-6810): The Timer-of-Flight Accessory facilitates the accurate measurement of the flight time of a ball launched by a PASCO projectile launcher. See page 33 (Time of Flight and Initial Velocity and Figure 9.1) for details of the setup.
  • Page 18 Smart Timer 012–06734A...
  • Page 19 012–06734A Smart Timer EQUIPMENT AND MATERIALS REQUIRED The purpose is to determine the acceleration due to the Earth’s gravity. The accepted value for the acceleration due to gravity on the Earth’s surface is 9.8 m/s With the Smart Timer, the acceleration due to Earth’s gravity can be quickly determined experimentally.
  • Page 20 Smart Timer 012–06734A 2. Insert the plug of the photogate into channel 1 or 2 of the Smart Timer, and set up the Smart Timer to measure Time, Fence. 3. Hold the Smart Timer Picket Fence in a position so it will drop vertically through the photogate and so the 5 cm fence will block the photogate beam as the fence drops through the photogate.
  • Page 21 012–06734A Smart Timer EQUIPMENT AND MATERIALS REQUIRED The purpose is to verify Newton’s Second Law, F = ma. Newton’s Second Law, F = ma, is a description of the relationship between F, the net force acting on the object of mass m, and a, the resulting acceleration of the object. For a cart of mass m on a horizontal track with a string attached over a pulley to a mass m (see Figure...
  • Page 22 Smart Timer 012–06734A 5. Place the Dynamics Cart on the track, attach a string to the hole in the end of the cart, and tie a mass hanger on the other end of the string. The string must be just long enough so the cart hits the end stop before the mass hanger reaches the floor.
  • Page 23 012–06734A Smart Timer EQUIPMENT AND MATERIALS REQUIRED The purpose of this experiment is to show that momentum is conserved in collisions. When two carts collide with each other, the total momentum ( p = mv ) of both carts is conserved regardless of the type of collision.
  • Page 24 Smart Timer 012–06734A 3. Set up the Smart Timer to measure Speed: collision (cm/s). Press to activate the Smart Timer. Note: If the flags of both carts do not go through the photogate beams twice, the Smart Timer will not complete the timing cycle and display velocities automatically.
  • Page 25 012–06734A Smart Timer 1. For each of the cases, calculate the momentum of each cart before the collision. Record the results in Table 3.2. 2. For each of the cases, calculate the total momentum of both carts before the collision. Record the results in Table 3.2.
  • Page 26 Smart Timer 012–06734A Part B—Elastic Collisions Set up the carts so the magnetic ends face each other, so the carts will repel each other when they collide. Record the data in Tables 3.3 and 3.4. Equal Masses a. Place one cart at rest in the middle of the track. Give the other cart an initial velocity toward the cart at rest.
  • Page 27 012–06734A Smart Timer % of After p2 After TOTAL TOTAL Before Before Before After Difference Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Trial 6 Trial 7 1. Kinetic energy is not conserved in inelastic collisions but it is conserved in ideal elastic collisions.
  • Page 28 Smart Timer 012–06734A...
  • Page 29 012–06734A Smart Timer EQUIPMENT REQUIRED The purpose of this experiment is to find the rotational inertia of a ring and a disk experimentally and to verify that these values correspond to the calculated theoretical values. Theoretically, the rotational inertia, I, of a ring about its center of mass is given by: I = 1 where M is the mass of the ring, R is the inner radius of the ring, and R...
  • Page 30 Smart Timer 012–06734A To find the rotational inertia experimentally, a known torque is applied to the object and the resulting angular acceleration is measured. Since = I , I = τ α where is the angular acceleration, which is equal to a/r, and is the torque caused by the weight hanging from the thread that is wrapped around the base of the apparatus.
  • Page 31 012–06734A Smart Timer 1. Place the disk directly on the center shaft as shown in Figure 4.3. The side of the disk that has the indentation for the ring should be up. 2. Place the ring on the disk, seating it in this indentation. 3.
  • Page 32 Smart Timer 012–06734A least three times and record the average values for weight of the hanging mass and acceleration in Table 4.2. 3. Using calipers, measure the diameter of the pulley about which the thread is wrapped and calculate the radius. 4.
  • Page 33 012–06734A Smart Timer Record the results of the following calculations in Table 4.3. 1. Subtract the “friction mass” from the hanging mass used to accelerate the apparatus to determine the mass, m, to be used in the equations. 2. Calculate the experimental value of the rotational inertia of the ring and disk together. 3.
  • Page 34 Smart Timer 012–06734A...
  • Page 35 012–06734A Smart Timer Note: The following experiments are in copy-ready form in the manual for the Dynamics Cart Accessory Track Set (manual number 012-05035) • Acceleration Down an Incline (Experiment 8): Use a Photogate and the Smart Timer instead of a stop watch (Figure 5.1). Adjust the height of the Photogate so the light path is intersected with the 5 cm fence of the Smart Timer fences.
  • Page 36 Smart Timer 012–06734A • Oscillations on an Incline (Experiment 4): Use a photogate and the Smart Timer instead of a stop watch, and use the ME-9471 Picket Fence spring ME-9471 (part number 648-04704), not the Picket Fence Smart Timer Picket Fence (Figure 7.1).
  • Page 37 012–06734A Smart Timer Note: The following experiment is in copy-ready form in the manuals for the Mini Launcher (manual number 012-05479) and the Ballistic Pendulum/ Projectile Launcher (manual number 012-05375) To Smart Timer • Projectile Motion Using channel 2 Photogates ( Experiment 2): Use the Smart Timer instead of a Photogates computer and IDS Timer...
  • Page 38 Smart Timer 012–06734A ball release • Determining the acceleration due mechanism to gravity (g) with the controller box of the Free Fall Adapter Free Fall Adapter (ME-9207B) Insert the plug of the Free Fall Adapter into channel 1 or 2 of the Smart Timer (Figure 10.1) Set up steel ball the Stopwatch mode of the Smart...

  • Page 39: Contacting Technical Support

    Approximate age of apparatus; For technical support, call us at 1-800-772-8700 A detailed description of the problem/sequence of (toll-free within the U.S.) or (916) 786-3800. events (in case you can’t call PASCO right away, you won’t lose valuable data); fax: (916) 786-3292 If possible, have the apparatus within reach when calling to facilitate description of individual parts.

This manual is also suitable for:

Me-8930

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