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x3 p125 Straight line kinematics lab revised Aug 2009

# x3 p125 Straight line kinematics lab revised Aug 2009 -...

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Straight-line Kinematics 1 SAN DIEGO MESA COLLEGE Name_________________________ PHYSICS 125 LAB REPORT Date __________Time___________ Partners ______________________ TITLE: Straight-line Kinematics ______________________________ ______________________________ ______________________________ Objective: To determine the acceleration of a glider by several different methods and to learn techniques of data recording and graphical analysis. Theory: List of the equations that describe the motion of an object moving in a straight line and with a constant acceleration. x = x o + v o t + ½ at 2 v = v o + at v avg = ½ (v i + v f ) In general: v avg = x / t v = dx / dt a avg = v / t a = dv / dt Equipment: Air track Ring stand Lab jack (or 2 X 4 wooden blocks) Blower and hose Meter stick ½ inch white-paper tape 12” ruler Masking tape Accessory box for air track: Tape timer Glider Bumpers Four 50-gram glider masses Rev. by Crivello 8-18-2009

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Straight-line Kinematics 2 Setup: P a pe r s t r i p Tape tim er Remove ”end stop” at this end only 9cm Blower Hose Pivot to match angle of track Ring stand perpendicular to air track Lab Jack Raise track at this end only Procedure: Level the airtrack with the tilt screws so that the glider shows no direction preference in its motion. Tilt the track by 8 – 10 centimeters by inserting the lab jack under the single leg support. Measure the height h of the lab jack and record on the diagram below. The distance D between the two points of support is 1.00 m. Measure it to be sure. THEORETICAL PREDICTION: If the track is horizontal the glider will not accelerate. If the track is vertical the glider will fall freely with an acceleration ( g ) of 980 cm/s 2 . If the track is inclined, the acceleration ( a) of the glider will depend on the angle of inclination: h = _________ DIAGRAM: D = _________ a 1 = g sin θ sin θ = h /D Thus a 1 = g h/D Calculations: Theoretical acceleration: a 1 = _____ __ cm/s 2
Straight-line Kinematics 3 EXPERIMENTAL TECHNIQUES: 1. Take a strip of white timer-paper and thread it through the first slot of the Pasco Tape Timer box, guide it between the rectangular metal bar and round ink paper, and then lastly through the second slot, and then tape it to the top edge of the glider as shown in the diagram. The tape timer box will make an ink dot on the white-paper strip at regular time intervals. In this experiment, the timer will be set to 10 Hz , so that the timer makes 10 dots on the paper each second. Thus the time between successive dots on your paper strip is 0.1 seconds. 2. Record the period of the dots (time interval between dots) on the data sheet. 3. Place two 50-gram glider masses on each side of the glider. 4. Hold the glider in position at the top of the track. Turn the air blower on and allow the air to circulate for several seconds. 5. Turn on the tape timer box, and release the glider. Catch the glider before it crashes into the end of the track. Now shut off the tape timer source. Remove the recording tape and check for missing or double dotted points and obvious misplaced points.

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