Focus Questions: 3-1: Describe how objects speed up and slow down 3-2: Describes how objects change direction

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1 Motion Graphing

2 Focus Questions: 3-1: Describe how objects speed up and slow down 3-2: Describes how objects change direction

3 Motion Graphing Speed Graphs A typical speed graph will have distance or position on the y-axis and time on the x- axis. Graphs help make motion easier to picture and understand. Lines represent an object in motion or speed. D i s t a n c e Speed Graph Time

4 Quick Action Motion Graphing 8 Practice Graphing Motion 1. Sketch out a graph in your INB. 2. Label the X axis (time). 3. Number the X axis - 8 in equal increments. 4. Label the Y axis (distance). 5. Label the Y axis 8 in equal increments. 6. Using the data table on the next slide plot the points. Y axis X axis

5 Distance (meters) Quick Action Motion Graphing Time (sec) Distanc e (m) Check your graph Time (sec)

6 Distance (km) Motion Graphing Constant Speed When the speed of an object remains the same, it does not increase or decrease. d/t (distance/time) 6/6 = 1km/minute 4/4 = 1km/minute Distance vs. Time Time (min)

7 Distance (km) Motion Graphing No Speed/Stopped An object is at rest. Ex. - Stopping at McDonalds for lunch. Time changes but distance stays the same Distance vs. Time Time (min)

8 Distance (meters) Quick Action Motion Graph - Interpretation In your own words describe the motion of the object shown in the graph Motion of an Unknown Object Time (sec)

9 Distance (km) Motion Graphing Velocity Velocity is speed in a given direction. Line A is moving away from point (the origin). Line B is moving back to point (the origin) Distance vs. Time A B Time (min)

10 Distance (km) Quick Action Motion Graph - Interpreting In your own words describe the motion of the student shown in the graph Student Walking to the Store (Include: time traveled, distance traveled, and velocity) Time (min)

11 Motion Graphing Distance vs. Time Graph Acceleration Change in speed or velocity over a specific amount of time. A curved line. The steeper the incline the faster the acceleration. D i s t a n c e Time Less Steep Incline Steep Incline

12 Distance Speed Graph Distance vs. Time Graph No Speed Time

13 Velocity (m/sec) Motion Graphing Acceleration Graphs A typical acceleration graph will have speed or velocity on the y-axis and time on the x-axis. Lines represent an object s acceleration or velocity Velocity vs. Time Time (sec)

14 Velocity (m/sec) Motion Graphing Velocity = 1m/s Constant Velocity When the velocity of an object remains the same, its rate of change does not increase or decrease. t = s t = 1s t = 2s t = 3s t = 4s t = 5s 2 1 Velocity vs. Time 1m/s at time 1sec. 1m/s at time 2 sec Time (sec)

15 Velocity (m/sec) Motion Graphing Constant Acceleration Acceleration is constant at any point on the line. 4m/s 2 at 1sec. 4m/s 2 at 2 sec. The steeper the slope the greater the acceleration Velocity vs. Time Time (sec)

16 Velocity (m/sec) Motion Graphing Increasing Acceleration Curved line indicates the acceleration is not constant. EX. - A car starts moving slowly and gradually increases its speed. The steeper the line the greater the rate of acceleration Velocity vs. Time Slower Acceleration Faster Acceleratio Time (sec)

17 Velocity (m/sec) Quick Action Motion Graph - Interpreting In your own words describe the motion of the student shown in the graph Velocity vs. Time Time (sec)

18 Velocity (m/sec) Acceleration Graph Velocity vs. Time Time (sec) Constant Spee

19 Check for Understanding Can you 1. Interpret an objects motion from a speed and acceleration graph? 2. Describe the characteristics of motion graphs? d i s t a n c e Speed Graph No speed Time

20 Quick Action Motion Graph - Application 1. Get with a partner 2. In your notebook make up two different scenarios and graph them. 3. You must create a speed graph and an acceleration graph. 4. Be sure to label everything on the graph and describe in sentences what is happening in each graph.

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