Inclined to Roll

Please Do NOT write on this handout. Thank you.Inclined to Roll (modified from text to use a ball and pairs of students in each group)In this activity you will work with your table partner to measure the time and distance of a moving objectin order to calculate its speed.Problem: How does the height of a ramp affect the time a ball takes to roll across the floor?Materials: (per group of 2) 2 connected orange ramps; meter stick(s); small pieces of masking tape;pieces of wood and/or books to prop up ramp; stopwatch, ballProcedure: 1. In your notebook (all students) make the data table like the one below, but add space for4 different ramp heights (not just two as shown below).(Title goes here)Title shouldinclude columnheadings (IV, DV)Height ofRamp(cm)DistanceTraveled(m)Trial1Time(s)AverageTime (s)Speed(m/s)1.52311.5232. Set up the ramp at the lowest height (cm) your group can create and still have the ball roll down andacross the floor for a distance of 1.5 meters. This will be your first height in the data table.3. Leaving room for the ball to roll along the floor, the end of the ramp becomes the starting line.Securely tape the ramp at this height, and then measure 1.5 meters across the floor from the end ofthe ramp and put a piece of tape on the floor as the finish line. Put an object just past the finish lineto stop the ball.4. Adjust the ramp as needed to ensure the ball rolls the 1.5 m as straight as possible. Use the meterstick(s) as a guiding line for the ball if necessary.5. Being sure no tape is impeding the rolling of the ball, the first group member should hold the ball at thetop of the ramp. When the second group member is ready, the first group member should releasethe ball. The timer starts the timer when the ball reaches the end of the ramp. The timer stops thetimer as the ball crosses the finish line.6. Record the time the ball takes to travel the 1.5 m across the floor. Repeat for 3 GOOD trials (times arevery close). Record 3 GOOD trial times. (Times that are repeatable.)7. Repeat steps 2-6 with 3 more progressively higher ramp heights. So for each of the 4 ramp heights:a. Measure height of ramp carefully from floor directly below the top of ramp. Measure after trialsto check height, toob. Average the 3 time trials and write the average in the data table.c. Use the distance traveled and the average time to calculate the average speed for each ramp height.Analyze and Conclude Questions(Every student writes their own answers in complete sentences on their own notebook paper.)1. How did you calculate the average speed of the ball for each ramp height?2. In this activity, what is the independent variable? (What did YOU change?)3. In this activity, what is the dependent variable? (What did you MEASURE and changes with the IV?)

4. In this activity, what NUMBERS & UNITS did you use to calculate speed?5. Create a one labeled and colored diagram of your ramp set-up. Use 2-headed ( ) arrows toshow: height of ramp and distance traveled across floor.6. Create 2 graphs: a. Graph the height (x-axis) vs. the average time to travel (y-axis)…..and b. Graph the height (x-axis) vs. the calculated speed (y-axis)USING the Requirements for Data Tables and Graphs handout. These graphs may be onthe same piece of graph paper (front and back). So for these 2 graphs:• Be sure to USE a ruler for both axis lines.• Be sure to number both axis lines evenly.• Be sure to add labels and units of measurement to both axis lines.• Be sure to graph dots correctly and connect the dots.• Be sure to add a title that includes both axis line labels.7. What is the relationship between height of the ramp and time the ball takes to travel 1.5 meters?(Begin your answer this way: “As the height of the ramp increases, the time of ..... )8. What data do you have to support your answer to #7?9. What is the relationship between the height of the ramp and the speed at which the ball travels 1.5 macross the floor? (Begin your answer: “As the height of the ramp increases, the speed of ... )10. What data do you have to support your answer to #9?11. What is your control for this experiment?(HINT: You DON’T have a zero value for your independent variable, so you’ll need to pick one of theIVs…. So pick your lowest ramp height, because you are comparing all the other higher ramp heights tothis lowest one to know how increasing the ramp height affects the time and speed of the ball to travel.)12. List AT LEAST 5 of the MOST IMPORTANTS constants you and your partner used or SHOULDHAVE used for this experiment.13. Please assess the performance of your partner by copying the sentence below in your notebook andon your notebook paper circle the appropriate number.My partner was 1 2 3 4 5 during this activity.(1 is uncooperative and unhelpful; 5 is extremely cooperative and extremely helpful)REMEMBER, please DO NOT write on this handout. Thank you.