WHAT IS INSTANTANEOUS SPEED?

Transcription

1 Must Read: On the front of this worksheet, you ll see a data table. This data table shows the time and the distance of the wolf. The speed calculated, however, is not calculated as average speed. The speed calculated is instantaneous speed. There has been much confusion on this because so many students and teachers are used to calculating average speed. s you know, average speed is taking a total distance divided by total time. However, in this worksheet, you are not calculating the average speed. In this data table, you are taking each change in distance divided by each change in time giving you the speed of the wolf at each second (or its instantaneous speed.) For better understanding of this concept, please watch the following video: WHT IS INSTNTNOUS SPD?

2 NM DT QR COD: What is INSTNTNOUS SPD? wolf sees a rabbit and goes for its prey. Calculate the speed of the wolf, using the table below, and then illustrate its motions using the graphs to the right. Do not forget to label your graphs and show correct units. Time (s) Distance (m) Speed (m/s) GRPHING INSTRUCTIONS: Label the X- axis and the Y-axis with name and unit of measurement. Number the lines logically. On the Distance/Time Graph, label the parts of the graph where the wolf was: Speeding Up Slowing Down Constant Speed Stationary The Wolf s Change in Distance On the Speed/Time Graph, each line must be labeled as one of the following: Speeding Up Constant Speed Slowing Down Stationary The Wolf s Change in Speed 1. Did the wolf ever run at a constant speed? xplain your answer. 2. Was the wolf ever at rest? If yes, then how do you know?

3 What is the definition of DISTNC? What is the definition of DISPLCMNT? INSTRUCTIONS: Differentiate between distance and displacement for the wolf that started at point and traveled as shown to point. Describe how the wolf s distance and displacement would be exactly the same, but in a different place from where it began.

4 KY NM DT QR COD: What is INSTNTNOUS SPD? wolf sees a rabbit and goes for its prey. Calculate the speed of the wolf, using the table below, and then illustrate its motions using the graphs to the right. Do not forget to label your graphs and show correct units. Time (s) Distance (m) Speed (m/s) GRPHING INSTRUCTIONS: Label the X- axis and the Y-axis with name and unit of measurement. Number the lines logically D 60 I S T 50 N 40 C 30 (m) On the Distance/Time Graph, label the parts of the graph where the wolf was: Speeding Up Slowing Down The Wolf s Change in Distance SPDING SLOWING DOWN CONSTNT SPD Constant Speed Stationary STTIONRY SPDING Time (s) On the Speed/Time Graph, each line must be labeled as one of the following: Speeding Up Constant Speed Slowing Down Stationary The Wolf s Change in Speed 1. Did the wolf ever run at a constant speed? xplain your answer. Yes, from 3 to 5 seconds, the wolf ran for 20 m /s 15 S P D 10 (m/s) SPDING CONSTNT SPD SLOWING DOWN 2. Was the wolf ever at rest? If yes, then how do you know? Yes, at 7 seconds and 75 meters, the wolf reached 0 m /s. 5 SPDING Time (s) STTIONRY

5 What is the definition of DISTNC? Distance is the measurement or quantity known as how much ground an object has covered during its motion. What is the definition of DISPLCMNT? Displacement is the difference between the initial, or starting, position and the final position INSTRUCTIONS: Differentiate between distance and displacement for the wolf that started at point and traveled as shown to point Describe how the wolf s distance and displacement would be exactly the same, but in a different place from where it began. If the wolf were to move straight forward for a specific distance and stop without changing direction.