Motion Graphing
Focus Questions: 3-1: Describe how objects speed up and slow down 3-2: Describes how objects change direction
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
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 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 X axis
Distance (meters) Quick Action Motion Graphing Time (sec) Distanc e (m) 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 8 7 6 5 4 3 2 1 Check your graph 1 2 3 4 5 6 7 8 Time (sec)
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 9 8 7 6 5 4 3 2 1 Distance vs. Time 1 2 3 4 5 6 7 8 Time (min)
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. 9 8 7 6 5 4 3 2 1 Distance vs. Time 1 2 3 4 5 6 7 8 Time (min)
Distance (meters) Quick Action Motion Graph - Interpretation In your own words describe the motion of the object shown in the graph. 4 3 2 1 Motion of an Unknown Object 1 2 3 4 5 Time (sec)
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). 4 3 2 1 Distance vs. Time A B 1 2 3 4 5 6 Time (min)
Distance (km) Quick Action Motion Graph - Interpreting In your own words describe the motion of the student shown in the graph. 4 3 2 1 Student Walking to the Store (Include: time traveled, distance traveled, and velocity) 1 2 3 4 5 Time (min)
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
Distance Speed Graph Distance vs. Time Graph No Speed Time
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 9 8 7 6 5 4 3 2 1 Velocity vs. Time 1 2 3 4 5 6 7 8 Time (sec)
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. 1 2 3 4 5 6 7 8 9 Time (sec)
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. 2 16 12 8 4 Velocity vs. Time 1 2 3 4 5 Time (sec)
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. 9 8 7 6 5 4 3 2 1 Velocity vs. Time Slower Acceleration Faster Acceleratio 1 2 3 4 5 6 7 8 Time (sec)
Velocity (m/sec) Quick Action Motion Graph - Interpreting In your own words describe the motion of the student shown in the graph. 9 8 7 6 5 4 3 2 1 Velocity vs. Time 1 2 3 4 5 6 7 8 Time (sec)
Velocity (m/sec) Acceleration Graph Velocity vs. Time 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 Time (sec) Constant Spee
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
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.