ࡱ> DFCL bjbjcTcT zt>>FP1118it1.^7(___:::.......0?3T.:::::.__.222:|__.2:.22,-_Gh1,n..0.,63V3,-3-|::2:::::..2:::.::::3::::::::: :  Partner 1: ____________________ Partner 2: ____________________ Block: _______ Partner 3: ____________________  Background: Recall that speed is a scalar quantity and so we will not measure the direction of travel. We will calculate distance traveled in meters (m) and time traveled in seconds (s). The average speed, Savg, equals distance in meters divided by time in seconds. The units are (m/s). So, Savg =  EMBED Equation.3  =  EMBED Equation.3  Units are:  EMBED Equation.3   Equipment needed for each group: Pencils Lab Sheet Calculator Meter stick, Masking tape Timer  Experimental Procedure: You will develop this in class before you run your trials. Before your team begins, develop a step-by-step plan on a separate sheet of paper. Describe what you will do to gather the required data. Staple the procedure to the lab before going outside. Sample Activities: Walk Run Moon Walk Crab Walk Tumble Roll Each lab team must choose two of the kinematics (motion) activities, or create a new form of motion to measure. Select a measurement device and measure out a distance of 3, 6, 9, 12, and 15meters. You may need to partner with another team to do this. Perform each race a distance of 3, 6, 9, 12 and 15 meters and measure the time. Record data on the Data Sheet on page 2. If time permits, repeat events to try to improve the time. Data Sheet  Estimate your average speed for each type of activity before you begin the lab activity. Activity 1 estimated average speed: _______________ m/s. Activity 2 estimated average speed: _______________ m/s. Time (s)Dist (m)Time (s)Dist (m)0033669912121515 Graphical Analysis  Directions: Graph your activities here. Use a different color for each activity. DO NOT use ink. Neatness is important and you will need to erase something! Graph distance versus time. (Distance on the conventional y-axis and time on the x-axis) Put a title on your graph. Choose an appropriate scale for your time on the x-axis. Ask for help if needed. Draw a straight-line approximation of your distance vs. time. Use a ruler! Be neat!  Questions: Answer the following. Be neat!  Which event had the greatest average speed? Does this experimental technique capture any instantaneous speeds? Why or why not? Is the maximum speed reached during your race the same as the average speed you calculated? Is it higher? Lower? Why? Choose one of the average speeds from one of your events. Use google.com or similar to: Convert into miles per hour (mph) Convert into kilometers per hour (kph) Convert into ft/s Recall the equation for the slope of a line (Conventional  EMBED Equation.3  becomes  EMBED Equation.3 ). Determine the slope of each line on your graph. Show your work. What are the units of the slope of your graph? If your car is running on cruise control, what factors might cause the velocity to change above and/or below the cruising velocity? When an airplane is on autopilot, what factors might cause the velocity to change? If your car is going east at 25 m/s, give several devices on the car that could change its velocity (remember that velocity is a vector).      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