2 Kinematics - BC Science Physics 11

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Practice Problems 2.1.3 —Solving Motion Problems Graphically 1. Describe the motion represented in each of the following position-time graphs. �� 2. Sketch a graph of each of the following situations. (a) A golf ball is rolling towards a cup at 1.5 m/s [west]. (b) A person is watching from the view of the cup and seeing the ball roll 1.5 m/s [east]. (c) A person is traveling at 1.5 m/s [west] watching the cup roll towards the hole. 3. (a) Fill in the data table if a car is traveling at 30 km/h through a school zone. Time (s) 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Distance (m) (b) Graph this data on a distance vs. time graph. 44 Chapter 2 <strong>Kinematics</strong> © Edvantage Interactive 2012 ISBN 978-0-9864778-3-6
Investigation 2-1 Measuring the Speed of a Model Car Purpose To measure the speed of a model car, such as a radio-controlled vehicle Procedure 1. Remove a 5.0 m length of ticker tape from a roll. Pass one end of it through a recording timer, and then tape it to a battery-powered toy car. (Figure 2.3) �� Figure 2.1.1 Step 1 2. Turn on the timer and let the car travel at its full speed until all the tape has passed through the timer. 3. Every six dots is one-tenth of a second. Mark off the time intervals in one-tenth of a second on your tape 4. Measure the distance traveled in each tenth of a second. Record your data in a table similar to Table 2.1.1. Table 2.1.1 Data Table for Investigation 2-1 Time (s) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.0 1.1 … Distance per interval (cm) Total distance (cm) … 5. Create a distance vs. time graph. On the y-axis, use total distance and on the x-axis, use time. Draw a best-fit line on your graph. 6. Find the slope of your graph and record it along with the appropriate units. Concluding Questions 1. What does the slope of a distance-time graph represent? 2. Find the average speed of the toy car over five 1 s intervals of the trip. 3. Compare your slope of the distance-time graph with your average speed over the five 1 s intervals. 4. Why might the average speed of the car during the first 1 s intervals be less than the average speed later in the trip? © Edvantage Interactive 2012 ISBN 978-0-9864778-3-6 Chapter 2 <strong>Kinematics</strong> 45 …
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2 Kinematics - BC Science Physics 11

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