Nov. 8, 2017 Library Fees ! You need: Clean paper / pencil Warm Up: Potential Energy and Kinetic Energy are related. How? Explain I CAN: analyze and illustrate speed through graphs. Library Fees !

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How can we describe motion? Motion can be described by: DISTANCE (how far did it travel?) TIME (how long did it travel?) SPEED (how fast did it travel?) DIRECTION (which way did it go?) ACCELERATION (does the motion change?)

In math terms… Distance Speed = Time A “change in position over time” is the same as saying: Distance Speed = Time

D S T Speed = Distance Time Time = Distance Speed Distance = Speed x Time D S T

Speed vs. Velocity SPEED – tells you have fast or slow something is moving (changing position). Example = 25 km/h VELOCITY – tells you speed AND DIRECTION! (changing position in a certain direction) Example = 25 km/h EAST

E. This shows the fastest speed Lightning went all day. D. The car traveled 2 meters/min. C. Lightning went 3 meters in 5 minutes. A. The car stopped for 1 min. B. The car drove about ¼ meters per minute.

Leg 1 A. Sandy walked to track practice in 30 minutes. The track was 4 km away. B. Sandy went to track practice 3 km away in 15 minutes. C. Sandy ran to track practice in 3 minutes. D. Sandy walked to track practice in 10 minutes. The trip was 3 km. B

Christy Christy wanted to visit the zoo, which is 20 kilometers from her house. To help her get there, her mother drove her to the bus stop 5 kilometers away from home and toward the zoo. The trip took 5 minutes. She had to wait for the bus for 5 minutes. Christy was reading on the bus and missed her stop. She finally got off the bus 10 minutes later at the next stop 1 kilometer past the zoo. It took Christy 15 minutes to walk back to the zoo.

Joey’s graph Joey waited 60 minutes while his family got ready to go to the beach. They jumped in the car and got to the beach 60 kilometers away in 40 minutes. They were at the beach for 40 minutes when it started to rain. They headed for home, driving the first 10 kilometers in 10 minutes. It was raining so hard that they cut their speed in half in order to get home.

Now you try to build a graph. Choose a table of data from the choices at your table. Copy it onto your paper. Looking over your data, hypothesize about which Time Graph you think would be the best match to your data. (Be sure to write the letter of the graph you’ve chosen – and sketch it).

Hypothesis Actual You build a graph…cont’d. 3. Now graph the data from your data table. Actually draw out the graph onto graph paper. 4. Does your actual graph match the one that you THOUGHT was a match? Why or why not? Hypothesis Actual

You build a graph…cont’d. 5. Now, find the story or “interpretation” that you think would best match your data table and graph. 6. Write at least three sentences explaining why you think this is the best match.

Write a sentence Albert Bob Charlie Give a sentence about each – but be sure that it can be supported by the data. Albert Bob Charlie

Lesson Objective: You will be able to identify objects’ changes in motion on a speed-time graph.

https://www.youtube.com/watch?v=pM1dJGjRHOc If this embedded video does not load, the link is https://www.youtube.com/watch?v=pM1dJGjRHOc

Jiff walked on his hind legs 83 feet in 4 seconds Jiff walked on his hind legs 83 feet in 4 seconds. What is Jiff’s average speed?

What is Acceleration?

Acceleration Acceleration is: 1. Speeding up 2. Slowing down 3. Changing direction

Acceleration To speed up = accelerate. To slow down = decelerate.

Where are the x-y axes?

= speed time =

No Movement A horizontal line at the BOTTOM of the graph = no movement.

Constant Speed A horizontal line in the graph = constant speed.

Acceleration A line going up = acceleration (speeding up).

Deceleration A line going down = deceleration (slowing down).

1 = No Movement 2 = Constant Speed 3 = Acceleration 4 = Deceleration

Labeling & Gluing in Graphs

Constant Accelerating Accelerating Constant Decelerating Rest

Partner Practice