<p> CARDINAL NEWMAN CATHOLIC SECONDARY SCHOOL</p><p>Name: ______Date: ______SNC 2D 1</p><p>LAB – DETERMINING AN AVERAGE SPEED INQUIRY: ___ / 25</p><p>PURPOSE: The purpose of this lab is to determine the average speed of an object in uniform motion (using a ticker tape and cart)</p><p>DESIGN:</p><p>In this experiment you will attach a cart to the ticker tape and let it run down a smooth, slightly inclined ramp at a constant speed.</p><p>You will gather quantitative data and use a distance-time graph to calculate the average speed of the cart</p><p>MATERIALS:</p><p>Ticker tape timer Roll of tape Cart 1 or 2 tables Small wood blocks or books (Adhesive) tape Stand and clamps for the timer and/or tape roll</p><p>PROCEDURE:</p><p>1. Place the cart at one end of the board and adjust the height of the board until the car just starts to move</p><p>2. Set up the ticker tape timer at the upper end of the ramp and either hold or clamp it in place.</p><p>3. Attach the end of the tape to the cart with a piece of adhesive tape</p><p>4. Do a trial run to make sure that the tape runs smoothly through the timer when the cart is released, and that the cart’s speed is about constant</p><p>5. Return the cart to the top of the track, turn on the timer and then immediately release the cart CARDINAL NEWMAN CATHOLIC SECONDARY SCHOOL</p><p>Name: ______Date: ______SNC 2D 2</p><p>6. Turn off the timer and stop the cart when it reaches the end of the ramp</p><p>7. Cut the tape near the timer and remove the tape from the cart</p><p>8. Record the timer setting in milliseconds</p><p>(a) Starting at the dot where the dots begin to be equal distances apart, measure the total distance traveled by calculating the length of each interval.</p><p> EVERY 6 DOTS = 1 ms (1 millisecond)</p><p>(b) Enter the values of the time and distance measurements into the table in the OBSERVATIONS section</p><p>/10 OBSERVATIONS/TABLES (See “Sample Data” at end for example)</p><p>DOT TOTAL TIME (ms) d (CHANGE IN d (TOTAL INTERVAL DISTANCE in cm) DISTANCE in cm) 1 – 6</p><p>6 – 12</p><p>13 – 18</p><p>19 – 24</p><p>25 – 30</p><p>31 – 36</p><p>37 – 42</p><p>43 – 48</p><p>49 – 54</p><p>55 – 60 CARDINAL NEWMAN CATHOLIC SECONDARY SCHOOL</p><p>Name: ______Date: ______SNC 2D 3</p><p>/ 5 GRAPH</p><p>DISCUSSION</p><p>/ 3 1. List the following variables:</p><p>(a) Controlled variables:</p><p>(b) Independent variable:</p><p>(c) Dependent variable:</p><p>/ 2 2. The design for this experiment tried to compensate for the effect of friction. How was this done? CARDINAL NEWMAN CATHOLIC SECONDARY SCHOOL</p><p>Name: ______Date: ______SNC 2D 4</p><p>3. Using your graph, answer the following questions re: average speed.</p><p>/ 3 (a) Calculate the average speed</p><p>/ 2 (b) Did your car travel at a constant speed? How do you know.</p><p>SAMPLE DATA</p><p>DOT TOTAL TIME (ms) d (CHANGE IN d (TOTAL INTERVAL DISTANCE in cm) DISTANCE in cm) 1 – 6 1 0.5 0.5</p><p>6 – 12 2 0.9 0.9 + 0.5 = 1.4</p><p>13 – 18 3 1.2 1.2 + 1.4 = 2.6</p><p>19 – 24 4 1.6 1.6 + 2.6 = 4.2</p>